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...e likelihood that the offspring are his. Internal fertilization, common in mammals and birds, can make paternity less certain than external fertilization (com === Mammals === ...

...tera, characterized by their forelimbs adapted as wings. They are the only mammals capable of sustained flight and are found in a variety of habitats all over [[Category:Mammals]] ...

Cats (''Felis catus'') are domesticated mammals that are often kept as pets. They belong to the family Felidae and are know ...

* [[Mammals]] ...

...s that many animals are sentient, particularly [[Vertebrate|vertebrates]] (mammals, birds, fish) and some [[Invertebrate|invertebrates]] (e.g., [[Cephalopod|c ...