These lakes become home to waterfowl, most especially ducks, geese and swans. Some of these are all-year residents, others may be migratory. Ospreys also commonly visit and in some cases breed on reservoirs. If the reservoir's edge is shallow enough, marshes may develop along the edge which can be home to waders such as bitterns.
Otters swim around the edges of these lakes and they are often well stocked (sometimes artificially) with fish. However, many reservoirs are also major centers of human recreational activity, resulting in disturbance that can affect the presence of these shy animals.
Amphibians are also present in these lakes, including salamanders and others that do not have a land-dwelling adult phase. North American bullfrogs also often breed in reservoirs. Properly managed reservoirs can provide valuable habitat for a variety of water-loving species.
Cameroon clawless otter
North american otter
La plata otter
Indian smooth-coated otter
Dolphins, porpoises, and whales
Blind river dolphin
Dugongs, manatees, and sea cows
Read more at the list of biomes of the world...