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Not Like Others

JUAN BARRETO—AFP/GETTY IMAGES

Most animals in groups have similar traits. Some animals differ from their groups. Read these three examples.

Penguins

Penguins (above) are birds. Most birds can fly. Penguins cannot. But they do have wings. Their wings help them swim.

Platypuses

JOHN CARNEMOLLA—GETTY IMAGES

The platypus is one of the only mammals that lays eggs. It lays one or two at a time. It has a beak but is not a bird.

Dolphins

NICK UT—GETTY IMAGES

Dolphins live in water but are not fish. They are mammals. They do not breathe with gills. They have lungs, like other mammals.