Across
1
Egg-laying mammal with a duck bill
3
Amphibian that leaps and croaks
4
Large animal with a horn on its nose
8
Clawed sea crustacean
9
Slow-moving mollusk without a shell
10
Small spiny mammal
11
Largest mammal in the ocean
12
Large North American buffalo
Down
2
Animal known for fighting snakes
5
King of the jungle
6
Animal that builds dams
7
Flightless bird that swims in cold regions