Select the mammal.
A: Nile crocodile
B: cobra
C: green frog
D: humpback whale
A Nile crocodile is a reptile. It has scaly, waterproof skin.
Crocodiles hunt their prey in or near water.
A green frog is an amphibian. It has moist skin and begins its life in water.
Frogs live near water or in damp places. Most frogs lay their eggs in water.
A cobra is a reptile. It has scaly, waterproof skin.
Most cobras have a wide, flat hood below their head. A cobra can display its hood to scare away a predator.
A humpback whale is a mammal. It has hair and feeds its young milk.
Whales are mammals that live in the ocean. Humpback whales have small hairs that grow from bumps around their mouth.