Select the one animal that has all of the monotreme traits listed above.

 - Hippopotamuses have small hairs near their mouths and ears, but most of their skin is hairless. Their skin makes a reddish-brown substance that acts like sunscreen! Hippopotamuses give birth to live offspring.
 - Platypuses have fur and a rubbery bill that looks similar to a duck's beak. A platypus uses its bill to find food. Young platypuses hatch from eggs. After hatching, they drink milk from their mother.
To decide if an animal is part of a group, look at the traits of the group.
Monotremes have the following traits:
They make eggs with shells.
They have fur or hair.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A platypus has the following traits:
It makes eggs with shells.
It has fur.
A platypus has the traits of a monotreme. A platypus is a monotreme.
A hippopotamus has the following traits:
It gives birth to live offspring.
A hippopotamus does not have all of the traits of a monotreme. A hippopotamus is a placental mammal.