A dolphin is a mammal because they breath air just like humans
neither.its a bird.
Birds are nieter a bird or a reptile because a mammal has hair and fur and a reptile has a dry and scaly skin and ONLY a bird has FEATHERS!
Birds neither reptiles nor mammals; they are classified as aves.
Penguins are flightless birds
Zoologico De Vallarta, Mexico
The Wildlife Habitat of the Western Australian Wilderness
Discovering Forests of Mount Njesi
First Scientifically Confirmed Poisonous Bird