Select the one animal that has all of the mammal traits listed above.
Common toads have moist skin covered in lumps. These lumps are sometimes called warts, and they are a normal part of the toad's skin. Common toads hatch from eggs with no shells. The tadpoles live underwater. Adult toads live in holes or under leaves on land. Female black-capped squirrel monkeys carry their offspring on their backs. They also feed their offspring milk. Adult squirrel monkeys eat fruit and insects.
Mammals are a group of animals with similar traits. The following traits can be used to identify mammals:
They feed their offspring milk.
They have fur or hair. Observe the animals and read the descriptions.
Scientists sort animals with similar traits into groups. This is called classification. Classification helps scientists learn about how animals live.
How do scientists classify animals? First, they make observations about an animal. Scientists observe the animal's traits, including its body parts and behavior. Then, scientists compare the animal's traits to other animals' traits. Scientists classify animals with similar traits into a group.
To decide if an animal is part of a group, look at the traits of the group.
Mammals have the following traits:
They feed their offspring milk.
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 black-capped squirrel monkey has the following traits:
It feeds its offspring milk.
It has fur.
A black-capped squirrel monkey has the traits of a mammal. A black-capped squirrel monkey is a mammal.
A common toad has the following traits:
It spends part of its life in water and part on land.
It has moist skin.
It makes eggs with no shells.
A common toad does not have all of the traits of a mammal. A common toad is an amphibian.