A penguin belongs to the vertebrate group of birds.
The apes
reptiles
reptiles
reptile
They are amphibians
fish
bird
Humans belong to the group of vertebrates known as mammals.
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.
chordata
mammals