Offshore Wind

Harnessing wind energy in offshore environments.

Similar to land-based wind technologies, offshore wind uses turbines to generate energy which is delivered to the shore via an export cable. A main advantage of offshore wind is the stronger and more consistent winds that blow offshore, allowing the use of larger turbine blades. The development of offshore wind in Europe and Asia has preceded development activities in other parts of the world. However, several projects in the United States are currently underway. While the most common offshore wind energy technology is a three-bladed horizontal axis turbine, there are a variety of foundation types which can support the deployment of devices in a range of aquatic environments – shallow nearshore habitats to deeper offshore environments.

 

Monopile Foundation

 

Monopile foundations are used at shallow depths (0-30 m) and consist of a pile being driven to varying depths into the seabed (10-40 m) depending on the soil conditions. The pile-driving construction process is an environmental concern as the noise produced is incredibly loud and propagates far in the water, even after mitigation strategies such as bubble shields, slow start, and acoustic cladding are employed. As with land-based wind energy, collision risk with birds and bats is a major concern, though the impact is more difficult to quantify because carcasses that provide evidence of collisions become lost at sea. While the footprint of offshore wind energy is relatively small, it may still cause scouring. As with all electricity generation, there is a slight concern that electromagnetic fields generated by power cables may affect animals that use Earth's natural magnetic field for orientation, navigation, and hunting. Likewise, chemicals such as anti-corrosion paint and small amounts of oil and grease may enter the waterbody during spills, though some turbine designs do not require lubrication. Artificial reefing is likely to occur around wind farms as the new hard substrate provides protection and attracts colonizing invertebrates.

Tripod Fixed Bottom

 

Tripod fixed bottom foundations are used at transitional depth (20-80 m) and consist of three legs connecting to a central shaft that supports the turbine base. Each leg has a pile driven into the seabed creating a wide foundation that allows for the piles to be placed at a shallower depth in the seabed. The environmental effects are very similar to monopiles, except that the footprint is a little larger.

Gravity Foundation

 

Gravity foundations are used at shallow depths (0-30 m) and consist of a large and heavy base constructed of steel or concrete to rest on the seabed. The footprint is relatively large and may cause scouring, artificial reefing, or physical destruction of habitats upon introduction. Otherwise, the environmental effects are similar to monopiles.

Gravity Tripod

 

Gravity tripod foundations are used at transitional depths (10-40 m) and consist of two heavy concrete structures connected by three legs where one structure sits on the seabed while the other sits above the water. Very few offshore windfarms are currently using this foundation. The environmental concerns are identical to those of gravity foundations, though the scouring effect may be less significant depending on the design.

Floating Structure

 

Floating structure foundations are used at deep depths (40-900 m) and consist of a balanced floating structure moored to the seabed with fixed cables. The floating structure may be stabilized using buoyancy, mooring lines, or a ballast. The mooring lines may cause minor scouring or pose a risk of collision, but the turbine foundation is mostly located in the upper layer of the water column where there tend to be less organisms.

Total Results: 1266
Title Author Date Type of Contentsort descending Technology Type Stressor Receptor
Request for advice on the populations of cetaceans that might be involved in significant interactions with marine renewable energy developments in Scottish marine waters Northridge, S. August 2012 Report Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind Marine Mammals, Cetaceans
Depth use and movements of homing Atlantic salmon (Salmo salar) in Scottish coastal waters in relation to marine renewable energy development Godfrey, J., et al. December 2014 Report Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind Fish
Current state of knowledge of effects of offshore renewable energy generation devices on marine mammals & research requirements Thompson, D., et al. July 2013 Report Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind Marine Mammals
Prioritisation of monitoring and research for diadromous fish in the context of Marine/Offshore Renewables: A summary of stakeholder engagement meetings between Marine Scotland, wild fisheries interests and wind, wave and tidal developers Hunter, D., Malcolm, I., Armstrong, J. March 2014 Report Marine Energy general, Wind Energy general, Offshore Wind Fish, Socio-economics, Fishing, Stakeholder Engagement
Telemetry for migratory bats - a feasibility study Lagerveld, S., et al. February 2017 Report Wind Energy general, Offshore Wind Bats
Bat Flight Analysis around Wind Turbines - A Feasibility Study Lagerveld, S., et al. March 2017 Report Wind Energy general, Offshore Wind Bats
Migrating bats at the southern North Sea: Approach to an estimation of migration populations of bats at the southern North Sea Limpens, H., et al. March 2017 Report Wind Energy general, Offshore Wind Bats
Bat 1: Estimate of bat populations at the southern North Sea - Supporting note to ZDV report no. 2016.031 Migrating bats at the southern North Sea Lagerveld, S., et al. March 2017 Report Wind Energy general, Offshore Wind Birds
Investigations of the Bird Collision Risk and the Responses of Harbour Porpoises in the Offshore Wind Farms Horns Rev, North Sea, and Nysted, Baltic Sea, in Denmark - Part II: Harbour porpoises Diederichs,A., Hennig, V., Nehls, G. January 2008 Report Wind Energy general, Offshore Wind Noise, Static Device Marine Mammals
Seabirds? What seabirds? An exploratory study into the origin of seabirds visiting the SE North Sea and their survival bottlenecks Leopold, M. May 2017 Report Wind Energy general, Offshore Wind Birds, Seabirds
A first approach to deal with cumulative effects on birds and bats of offshore wind farms and other human activities in the Southern North Sea Leopold, M., et al. January 2015 Report Wind Energy general, Offshore Wind Bats, Birds, Seabirds
Iteration cycle: Dealing with peaks in counts of birds following active fishing vessels when assessing cumulative effects of offshore wind farms and other human activities in the Southern North Sea Leopold, M., et al. March 2015 Report Wind Energy general, Offshore Wind Birds, Seabirds
2nd Iteration: Effect of turbine capacity on collision numbers for three large gull species, based on revised density data, when assessing cumulative effects of offshore wind farms on birds in the southern North Sea van der Wal, J., et al. May 2015 Report Wind Energy general, Offshore Wind Dynamic Device Birds, Seabirds
Standard Investigation of the Impacts of Offshore Wind Turbines on the Marine Environment (StUK4) Bundesamt fur Seeschifffahrt und Hydrographie (BSH) October 2013 Report Wind Energy general, Offshore Wind Nearfield Habitat
Hong Kong Offshore Wind Farm in Southeastern Waters - Environmental Impact Assessment BMT Asia Pacific Ltd March 2009 Report Wind Energy general, Offshore Wind Socio-economics, Environmental Impact Assessment
Measuring the Interaction Between Marine Features of Special Protection Areas with Offshore Wind Farm Development Sites Through Telemetry: Final Report Thaxter, C., et al. March 2014 Report Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Seabirds
Draft Generic Environmental Impact Statement for Procurement of Offshore Wind New York State Department of Public Service, Ecology and Environment, Inc. February 2018 Report Wind Energy general, Offshore Wind Socio-economics, Environmental Impact Assessment
MaRVEN: Environmental Impacts of Noise, Vibrations and Electromagnetic Emissions from Marine Renewable Energy Dictorate-General for Research and Innovation (European Comission), Kosecka, M. March 2016 Report Marine Energy general, Tidal, Wave, Offshore Wind EMF, Noise Nearfield Habitat
Analyzing Coastal and Marine Changes – Offshore Wind Farming as a Case Study Lange, M., et al. January 2010 Report Wind Energy general, Offshore Wind Energy Removal, Static Device Benthic Invertebrates, Birds, Ecosystem, Fish, Socio-economics
Open Ocean Aquaculture and Offshore Wind Farms. A feasibility study on the multifunctional use of offshore wind farms and offshore mariculture in the North Sea area Buck, B. January 2002 Report Wind Energy general, Offshore Wind Socio-economics, Fishing
Underwater Acoustic Modeling Report - Virginia Offshore Wind Technology Advancement Project (VOWTAP) Tetra Tech December 2013 Report Wind Energy general, Offshore Wind Noise
A Stochastic Collision Risk Model for Seabirds in Flight McGregor, R., et al. April 2018 Report Wind Energy general, Offshore Wind Birds
AdBm Demonstration at Butendiek Offshore Wind Farm with Ballast Nedam January 2014 Report Wind Energy general, Offshore Wind Noise
Collision, Displacement and Barrier Effect Concept Note Humphreys, E., Cook, S., Burton, N. January 2015 Report Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Raptors, Seabirds, Shorebirds
The Rhode Island Ocean Special Area Management Plan 2008-2015: From Inception through Implementation Smythe, T., Andrescavage, N., Fox, C. January 2016 Report Wind Energy general, Offshore Wind Socio-economics, Marine Spatial Planning
Marine bird colony and at-sea distributions along the Oregon coast: Implications for marine spatial planning and information gap analysis Suryan, R., et al. April 2012 Report Marine Energy general, Wind Energy general, Offshore Wind Birds
OSPAR request to advise on the current state and knowledge of studies into the deployment and environmental impacts of wet renewable technologies and marine energy storage systems April 2019 Report Marine Energy general, Wind Energy general, Offshore Wind Energy Removal, Noise Birds, Farfield Environment, Fish, Marine Mammals, Socio-economics, Aesthetics
A Case Study on the Effects of Underwater Noise During the Construction of Large Offshore Wind Farms Mason, T., Barham, R., Nedwell, J. November 2012 Conference Paper Wind Energy general, Offshore Wind Noise
Assessing the Environmental Impact of Underwater Noise During Offshore Windfarm Construction and Operation Nedwell, J., et al. November 2012 Conference Paper Wind Energy general, Offshore Wind Noise Farfield Environment, Fish, Marine Mammals, Nearfield Habitat
Assessment of the Environmental Impact of Offshore Wind-Farms OSPAR Commission January 2008 Conference Paper Wind Energy general, Offshore Wind Benthic Invertebrates, Birds, Fish, Marine Mammals
Cumulative Effects of Wind Farms in the Dutch North Sea on Bird Populations Poot, M., et al. June 2012 Conference Paper Wind Energy general, Offshore Wind Dynamic Device Birds
Developing an Instrumentation Package for in-Water Testing of Marine Hydrokinetic Energy Devices Nelson, E. August 2010 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind
Development of a New Underwater Piling Noise Mitigation System - Using Hydro Sound Dampers (HSD) Kuhn, C., et al. July 2012 Conference Paper Wind Energy general, Offshore Wind Noise
Does the Wind Power Industry Threaten Marbled Murrelets or Do Marbled Murrelets Threaten the Wind Power Industry? Cooper, J., Beauchesne, S. March 2004 Conference Paper Wind Energy general, Offshore Wind Dynamic Device Birds, Seabirds
Review of the Current State of Knowledge on the Environmental Impacts of the Location, Operation and Removal/Disposal of Offshore Wind-Farms OSPAR Commission April 2006 Conference Paper Wind Energy general, Offshore Wind Chemicals, EMF, Energy Removal, Noise, Static Device Birds, Socio-economics
Is a German Harbour Porpoise Much More Sensitive than a British One? Comparative Analyses of Mandatory Measures for the Protection of Harbour Porposes (Phocoena phocoena) During Offshore Wind Farm Ramming in Germany, Denmark and the UK Luedeke, J. December 2012 Conference Paper Wind Energy general, Offshore Wind Noise
Life Cycle Assessment of a 150 MW Offshore Wind Turbine Farm at Nysted/Roedsand, Denmark Properzi, S., Herk-Hansen, H. July 2001 Conference Paper Wind Energy general, Offshore Wind Socio-economics, Life Cycle Assessment
Localization of Southern Resident Killer Whales Using Two Star Arrays to Support Marine Renewable Energy Ren, H., et al. October 2012 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind Marine Mammals, Cetaceans
Mitigation of Underwater Piling Noise Using New Hydro Sound Dampers (HSD) Elmer, K., et al. September 2011 Conference Paper Wind Energy general, Offshore Wind Noise Nearfield Habitat
Model for Underwater Noise Radiated by Submerged Wind Turbine Towers Hay, T., et al. June 2013 Conference Paper Wind Energy general, Offshore Wind Noise
Offshore Wind Farms and their Impact on Fish Abundance and Community Structure Stenberg, C., et al. September 2012 Conference Paper Wind Energy general, Offshore Wind Static Device Fish
On the Prediction of Pile Driving Induced Underwater Sound Pressure Levels Over Long Ranges Lippert, T., et al. July 2013 Conference Paper Wind Energy general, Offshore Wind Noise Farfield Environment
Potential Scour for Marine Current Turbines Based on Experience of Offshore Wind Turbine Chen, L., Lam, W., Shamsuddin, A. June 2013 Conference Paper Marine Energy general, Tidal, Wind Energy general, Offshore Wind Energy Removal, Static Device Nearfield Habitat
Problems and Benefits Associated with the Development of Offshore Wind-Farms OSPAR Commission January 2004 Conference Paper Wind Energy general, Offshore Wind Dynamic Device, Static Device
Proceedings of the Oregon Marine Renewable Energy Environmental Sciences Conference Boehlert, G., et al. April 2013 Conference Paper Marine Energy general, Wave, Wind Energy general, Offshore Wind EMF, Energy Removal, Static Device Benthic Invertebrates, Birds, Fish, Marine Mammals, Reptiles, Socio-economics
Review of Literature and Studies on Electro Magnetic Fields (EMF) Generated by Undersea Power Cables and Associated Influence on Marine Organisms Switzer, T., Meggitt, D. September 2010 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind EMF
Simulating Environmental Changes Due to Marine Hydrokinetic Energy Installations James, S., et al. September 2010 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind Energy Removal Farfield Environment, Nearfield Habitat
Small Scale Distribution of Fish in Offshore Wind Farms Hansen, K., Stenberg, C., Møller, P. September 2012 Conference Paper Wind Energy general, Offshore Wind Fish
The Added Value of 'Small-Scale' Monitoring of the Soft-Sediment Endobenthos around Offshore Wind Farms in the Belgian Part of the North Sea Coates, D., Vanaverbeke, M., Magda, V. September 2012 Conference Paper Wind Energy general, Offshore Wind Static Device Benthic Invertebrates, Nearfield Habitat
The Development of Benthic Communities on Hard Substrates within OWEZ, the First Dutch Offshore Wind Farm Noordzee Wind September 2012 Conference Paper Wind Energy general, Offshore Wind Static Device Benthic Invertebrates, Nearfield Habitat
The Measurement of the Underwater Radiated Noise from Marine Piling Including Characterisation of a "Soft Start" Period Robinson, S., Lepper, P., Ablitt, J. June 2007 Conference Paper Wind Energy general, Offshore Wind Noise
Turbine Height as a Management Tool for Collision Risk to Birds at Offshore Wind Farms Davies, I., Band, B. September 2012 Conference Paper Wind Energy general, Offshore Wind Dynamic Device Birds
Underwater Noise Generated from Marine Piling Robinson, S., Theobald, P., Lepper, P. January 2013 Conference Paper Wind Energy general, Offshore Wind Noise
WT-Bird: Bird Collision Recording for Offshore Wind Farms Wiggelinkhuizen, E., et al. November 2004 Conference Paper Wind Energy general, Offshore Wind Dynamic Device Birds
Whooper Swan Cygnus cygnus Migration in Relation to Offshore Wind Farms Griffin, L., Rees, E., Hughes, B. October 2010 Conference Paper Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Waterfowl
Mitigation of Low-Frequency Underwater Anthropogenic Noise using Stationary Encapsulated Gas Bubbles Lee, K., Wochner, M., Wilson, P. November 2012 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind Noise
Potential Impacts from a Worst Case Discharge from an United States Offshore Wind Farm Gunter, T. January 2014 Conference Paper Wind Energy general, Offshore Wind Chemicals
Effective Mitigation of Underwater Piling Noise Karl-Heinz, E. February 2014 Conference Paper Wind Energy general, Offshore Wind Noise
Post-Construction Results from The North Hoyle Offshore Wind Farm May, J. September 2005 Conference Paper Wind Energy general, Offshore Wind Benthic Invertebrates, Birds, Marine Mammals
Design and Initial Component Tests of an Integrated Avian and Bat Collision Detection System for Offshore Wind Turbines Flowers, J., et al. April 2014 Conference Paper Wind Energy general, Offshore Wind Dynamic Device Bats, Birds
The New Noise Mitigation System 'Hydro Sound Dampers': History of Development with Several Hydro Sound and Vibration Measurements Burns, B., et al. November 2014 Conference Paper Wind Energy general, Offshore Wind Noise
New Achievements in Underwater Noise Modelling for Offshore Pile Driving Trimoreau, B., et al. November 2014 Conference Paper Wind Energy general, Offshore Wind Noise
New Hydro Sound Dampers to Reduce Piling Underwater Noise Elmer, K., Savery, J. November 2014 Conference Paper Wind Energy general, Offshore Wind Noise
Dynamic Measurements of Pile Deflections as a Source of Underwater Sound Emissions during Impact Driving of Offshore Pile Foundations Kuhn, C., et al. November 2014 Conference Paper Wind Energy general, Offshore Wind Noise
Hydro Sound Measurements during the Installation of Large Diameter Offshore Piles using Combinations of Independent Noise Mitigation Systems Burns, B., et al. November 2014 Conference Paper Wind Energy general, Offshore Wind Noise
Responses of Harbour Porpoises to Pile Driving on a Temporal and Spatial Scale Braasch, A., Joost, M., Ketzer, C. February 2013 Conference Paper Wind Energy general, Offshore Wind Noise Marine Mammals
Real-Time Environmental Monitoring from a Wind Farm Platform in the Texas Hypoxia Zone Mullins, R., et al. October 2009 Conference Paper Wind Energy general, Offshore Wind
Modelling Potential Changes in Marine Biogeochemistry due to Large-Scale Offshore Wind Farms van der Molen, J., Rees, J., Limpenny, S. April 2013 Conference Paper Wind Energy general, Offshore Wind Energy Removal Farfield Environment, Nearfield Habitat
Noise Mitigation Measures and Low-noise Foundation Concepts - State of the Art Verfuß, T. January 2012 Conference Paper Wind Energy general, Offshore Wind Noise
Environmental aspects of designing multi-purpose offshore platforms in the scope of the FP7 TROPOS Project Lu, S., et al. April 2014 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind Static Device Socio-economics
Field Testing of Multiple Sensors in an Underwater Environment Monitoring System Chan, H., et al. April 2014 Conference Paper Wind Energy general, Offshore Wind
Eco-Maintenance for Complex Systems: Application on System of Renewable Energy Production Tchertchian, N., Millet, D. November 2014 Conference Paper Wind Energy general, Offshore Wind Ecosystem
Hybrid Wave and Offshore Wind Farms: a Comparative Case Study of Co-located Layouts [Conference Paper] Astariz, S., et al. September 2015 Conference Paper Marine Energy general, Wave, Wind Energy general, Offshore Wind
Combining Offshore Wind and Wave Energy Extraction: An Environmental Perspective Rumes, B., et al. September 2015 Conference Paper Marine Energy general, Wave, Wind Energy general, Offshore Wind
Marine Wind Farms and Cetaceans Doleman, S., Simmonds, M., Keith, S. May 2003 Conference Paper Wind Energy general, Offshore Wind Noise Marine Mammals, Cetaceans
Offshore Wind Turbines: An Overview of the Effects on the Marine Environment Riefolo, L., et al. July 2016 Conference Paper Wind Energy general, Offshore Wind
Modelling impacts of offshore wind farms on trophic web: the Courseulles-sur-Mer case study Raoux, A., et al. April 2016 Conference Paper Wind Energy general, Offshore Wind Ecosystem
Mooring System Considerations for Renewable Energy Standards Cribbs, A., et al. May 2017 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind Static Device
Feasibility and LCA for a Wave Dragon platform with wind turbines Soerensen, H.C., et al. June 2016 Conference Paper Wind Energy general, Offshore Wind Socio-economics, Life Cycle Assessment
Potential Impact of Submarine Power Cables on Crab Harvest Bull, A., Nishimoto, M. February 2016 Conference Paper Marine Energy general, Wind Energy general, Offshore Wind EMF Benthic Invertebrates
Proceedings of the Wind-Wildlife Research Meeting XI Schwartz, S. May 2017 Conference Paper Wind Energy general, Land-Based Wind, Offshore Wind Dynamic Device
Environmental Impact for Offshore Wind Farms: Geolocalized Life Cycle Assessment (LCA) Approach Guermont, C., et al. October 2013 Conference Paper Wind Energy general, Offshore Wind Dynamic Device, Static Device Socio-economics, Life Cycle Assessment
Stakeholder Perceptions of the Wave Hub Development in Cornwall, UK. West, J., Bailey, I., Whithead, I. September 2009 Conference Paper Offshore Wind Stakeholder Engagement
Coastal impact of a hybrid marine farm operating close to the Sardinia Island Onea, F., Rusu, L. May 2015 Conference Paper Marine Energy general, Wave, Wind Energy general, Offshore Wind Energy Removal Farfield Environment
Installing Offshore Wind Turbine Foundations Quieter: A Performance Overview of the First Full-Scale Demonstration of the AdBm Underwater Noise Abatement System Elzinga, J., et al. May 2019 Conference Paper Wind Energy general, Offshore Wind Noise
Environmental Sensitivity Modeling and Site Characterization Guttenplan, K., Koopman, M., Belin, D. May 2019 Conference Paper Wind Energy general, Offshore Wind Ecosystem, Nearfield Habitat
Evaluating Changes in the Marine Soundscape of an Offshore Wind Farm via the Machine Learning-Based Source Separation Lin, T., et al. June 2019 Conference Paper Wind Energy general, Offshore Wind Noise
Marine Fish Response to Pile Driving Sound January 2009 Research Study Annex IV Marine Energy general, Wind Energy general, Offshore Wind Noise Fish
Monitoring and Evaluation of Spatially Managed Areas (MESMA) January 2012 Research Study Annex IV Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind Static Device Socio-economics, Legal and Policy
Marine Energy Research Innovation and Knowledge Accelorator (MERIKA) March 2014 Research Study Annex IV Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind Fish, Marine Mammals, Socio-economics
PLOCAN Marine Test Site for Ocean Energy Converters April 2008 Project Site Annex IV Marine Energy general, Wave, Wind Energy general, Offshore Wind
Ocean Plug Planned Project Site Annex IV Marine Energy general, Wave, Wind Energy general, Offshore Wind
Poseidon Floating Power (Poseidon 37) September 2008 Project Site Annex IV Marine Energy general, Wave, Wind Energy general, Offshore Wind
Site d' Expérimentation en Mer pour la Récupération de l'Energie des Vagues (SEM-REV) January 2009 Project Site Annex IV Marine Energy general, Wave, Wind Energy general, Offshore Wind
Galway Bay Test Site January 2006 Project Site Annex IV Marine Energy general, Tidal, Wave, Wind Energy general, Offshore Wind
An Analysis of the Potential Acoustic Effects of Cape Wind's Offshore Wind Farm on Marine Mammal Populations Burgman, J. April 2010 Thesis Wind Energy general, Offshore Wind Noise Marine Mammals, Socio-economics, Stakeholder Engagement
An Evaluation of the Wildlife Impacts of Offshore Wind Development Relative to Fossil Fuel Power Production Jarvis, C. September 2005 Thesis Wind Energy general, Offshore Wind Chemicals, Static Device Benthic Invertebrates, Birds, Fish, Socio-economics
Aspects of Offshore Renewable Energy and the Alterations of Marine Habitats Wilhelmsson, D. January 2009 Thesis Marine Energy general, Wave, Wind Energy general, Offshore Wind Static Device Benthic Invertebrates, Fish, Nearfield Habitat
Development of a Cost Minimizing Strategy to Mitigate Bird Mortalities in a Wind Farm Singh, K. May 2012 Thesis Wind Energy general, Offshore Wind Dynamic Device Birds
Environmental Consequences of Offshore Wind Power Generation Parkinson, K. April 2001 Thesis Wind Energy general, Offshore Wind Energy Removal, Static Device Birds, Fish, Marine Mammals

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