TOEFL: Animals

Adjective ready or likely to attack or do harm to others
Black mambas are fast, lethally venomous and, when threatened, highly aggressive. Stories of their deadliness abound, and they have been aggrandized in African myth.
Verb hide by covering up or making harder to see
camouflage
To camouflage themselves, red-eyed tree frogs cover their blue sides with their back legs, tuck their bright orange feet under their belly, and keep their bulging red eyes shut.
Noun temporary union between persons or factions
Sister lions stay together all their lives in groups called prides, and brothers form coalitions when they set off to find other prides to conquer.
Verb come together, usually for a purpose
Most sea lion species congregate in large crowds on beaches during breeding season.
Adjective very friendly and sociable
In one of the most improbable - and adorable - animal pairings the gregarious dolphins seem to take a shine to the cat, named Thunder.
Adjective capable of arousing interest or curiosity
An intriguing creature, the cuttlefish can change its skin color, pattern, and even shape, all in the blink of an eye.
Noun one who is skilled at getting to a place
Known as skilled navigators of treacherous mountain conditions, maybe it isn’t such a surprise to find goats making their way up narrow trunks and branches of Argan trees.
Noun substance used as a coating to protect or decorate a surface
Flamingos secrete a pigment which they deliberately rub into their plumage, like putting on makeup.
Verb move over a large area without a fixed purpose or direction
A robust population of snow leopards roam the mountains of Afghanistan, a relief to conservationists worried about the effects of local conflict on the wildlife.
Verb move with a smooth, wavelike motion
The snakes flatten their bodies in the air and undulate from side to side at high speed creating an aerodynamic effect that allows them to 'fly' hundreds of feet from tops of trees.