Mammals are the most developmentally advanced group of animals. What distinguishes them from other vertebrates (such as reptiles, amphibians, birds and so on) are that they are wholly or at least partly covered in hair or fur, and that the mothers feed their young with milk from their mammary glands.
All mammals are warm blooded (but so are birds) and must maintain their bodies at a constant temperature, different for each species but within the range 35 to 40 oC. The smallest mammals are just a few cm long and weigh little more than a gram, while at the other extreme the largest whales grow to 30 metres in length and can weigh up to 150 tonnes.
| Barbastelle Bat ![]() Barbastella barbastellus |
Pipistrelle Bat ![]() Pipistrellus pipistrellus |
Brandt's Bat ![]() Myotis brandtii |
Bechstein's Bat ![]() Myotis bechsteinii |
Daubenton's Bat ![]() Myotis daubentonii |
Noctule Bat ![]() Nyctalus noctula |
| Leisler's Bat ![]() Nyctalus leisleri |
Whiskered Bat ![]() Myotis mystacinos |
Serotine Bat ![]() Epstesicus serotinus |
Natterer's Bat ![]() Myotis nattereri |
Greater Horseshoe Bat ![]() Rhinolophus ferrumequinum |
Lesser Horseshoe Bat ![]() Rhinolophus hipposideros |
More about batsOn other Bat Websites: |
British bat species not yet featured here:Grey Long-eared Bat - Plecotus austriacus Soprano Pipistrelle - Pipistrellus pygmaeus Nathusius's Pipistrelle - Pipistrellus nathusii |
Brown Long-eared Bat ![]() Plecotus auritus |
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Badger![]() Meles meles |
Brown Rat![]() Rattus norvegicus |
Dormouse![]() Muscardinus avellanarius |
Red Squirrel![]() Sciurus vulgaris |
Grey Squirrel![]() Sciurus carolinensis |
Rabbit![]() Oryctolagus coniculus |
Hedgehog![]() Erinaceus europaeus |
Water vole![]() Arvicola terrestris |
Mole![]() Talpa europaea |
Fox![]() Vulpes vulpes |
Polecat![]() Mustela putorius |
Shrew![]() Sorex araneus |
More about land-based mammals:On other mammal-related websites: |
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Mink![]() Lutreola vison |
Grey Seal![]() Halichoerus gryphus |
Otter![]() Lutra lutra |
More about aquatic mammals:On other mammal-related websites: |
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