Animals
Animals fed on milk after they are born
Mammals
Animals in danger of extinction
Endangered species
Gradually destroy the ground
Erode
Extremely heavy rain
Torrential
Move slowly
Go at a snail's pace
Lives in the ocean but it's a mammal
Dolphin
Lack of water
Water scarcity
Move quietly along the ground
Creep
Type of energy that can be used indefinitely
Renewable
The largest portion of sth
Lion's share
A place where animals live in nature
Habitat
Poisonous gases coming from the vehicles
Exhaust fumes
Hunt illegally
Poach
Living alone without a company of others
Solitary
Be nervous
Have butterflies in one's stomach
An animal that kills and eats other animals
Predator
Sharp nails in animals
Claws
Bring an animal back to an area after it has not existed there for some time
Reintroduce
Living in the sea
Marine
Sth competitive
A dog eat dog world
Animals without a backbone
Invertebrates
Skin covering of fish
Scales
Increase
Soar
Being active at night
Nocturnal
More dangerous than it seems
A wolf in sheep's clothing