Donkeys belong to the class Mammalia. More specifically, they belong to the order Perissodactyla. Within that order, they belong to the family Equidae.
Mammals
The donkey is a vertebrate
Penguins belong to a vertebrate group called aves.
fish
They are amphibians
reptiles
reptiles
The apes
bird
reptile
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.