Hippos are mammals in the artiodactyla (even toed ungulates). More closely related to whales than other species.
Penguins belong to a vertebrate group called aves.
fish
They are amphibians
reptiles
reptiles
The apes
bird
reptile
A vertebrate as it has a backbone.
The vertebrate group in which humans belong to is the mammal group.Humans belong to the Mammal group.
Sharks belong to the vertebrate group known as Fish. Specifically, they belong to the vertebrate group known as Chondrichthyes - all sharks and rays - which have skeletons of cartilage rather than bone.
mammals