warm-blooded animal with hair; feeds its young with milk.

cold-blooded animal with scaly skin; lays eggs on land.

cold-blooded animal with smooth skin; spends part of its life in water and part on land.

cold-blooded animal that breathes through gills; skeleton is made of cartilage or bone.

the only mammal that can fly

mammals that lay eggs

fatty layer that insulates some animals

animals that eat only plants

animals that are active during the night