any cold-blooded animal with the ability to live both on land and in water, such as toads, frogs, etc.

两栖动物, 两栖类
a class of animals to which crocodiles, lizards, etc. belong, characterized by having cold blood and scaly skin

爬行动物, 爬虫类
a hard, pointed, often curved structure found on the head of some animals, such as cows, goats, and sheep, made of keratin or bone, used for defense, display, or digging

角, 角状物
a group of animals, such as cows, sheep, etc. that are from the same species, which move and feed together

兽群, 牧群
each of the curved pointy teeth of some animals such as elephants, boars, etc., especially one that stands out from the closed mouth

獠牙, 象牙
species that do not possess or cannot develop a spinal column, such as an arthropod, mollusk, etc.

无脊椎动物, 软体动物
a dormant state in animals, characterized by lowered body temperature and metabolic activity, often during winter to conserve energy

冬眠, 休眠期
possessing or producing a toxin that is injected or delivered into another organism through a bite, sting, or other means

有毒的, 毒性的
(of animals or birds) moving from one place to another, often with the changing seasons

迁徙的, 移动的
describing an animal that has a stomach with four compartments and chews cud as part of its digestion process

反刍的, 反刍动物的
having two legs

双足的, 双腿行走的
