a class of animals to which humans, cows, lions, etc. belong, have warm blood, fur or hair and typically produce milk to feed their young
哺乳动物
any cold-blooded animal with the ability to live both on land and in water, such as toads, frogs, etc.
两栖动物
any of the order of mammals that carry their young babies in a pouch, such as kangaroos, found either in Australia or Americas
有袋类
a class of terrestrial arthropods that breathe air and have four pairs of limbs, such as spiders, scorpions, etc.
蛛形纲
a small creature such as a bee or ant that has six legs, and generally one or two pairs of wings
昆虫
a class of animals to which crocodiles, lizards, etc. belong, characterized by having cold blood and scaly skin
爬行动物
any small mammal with a pair of strong front teeth, such as mice, hamsters, rats, etc.
啮齿动物
any of the mammals that are categorized by thick skin and large hooves, such as elephants, rhinoceroses and hippopotami
厚皮动物
any bottom-dwelling marine fish with a flat body, a color similar to the seabed and both eyes on the upper side of the body
扁鱼
a strong mammal used for carrying heavy loads, also known as a beast of burden
负重动物
any tropical bird, the male of which is colorful and displays unique courtship skills, originated in Papua New Guinea and Australia
天堂鸟
any bird that migrates regularly from a region to another in different seasons of the year
small animals or insects that are believed to be destructive and are difficult to handle when they appear in a considerable number
害虫
an invertebrate animal with a segmented body and a chitinous exoskeleton, such as a spider, crab, etc.
节肢动物
species that do not possess or cannot develop a spinal column, such as an arthropod, mollusk, etc.
无脊椎动物
a large group of animals characterized by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes
脊椎动物
a group of mammals, including cows, buffalo, bison, and antelopes, that are characterized by cloven hooves and ruminant digestion
牛科的
a quadruped mammal with a slender build and curved horns that is native to Africa or Eurasia
羚羊
any mammalian animal that belongs to the same group as humans, such as monkeys, apes, lemurs, etc.
灵长类动物
a quadruped mammal that is herbivorous and has a complex digestive system from which it can bring the food back to its mouth and chew it again
反刍动物
an organism, typically an insect or a tick, that transmits a pathogen or parasite from one host to another
媒介
a type of marine invertebrate that can change its shape and form through a process called polymorphism
多态体
an animal, typically an insect or a bird, that transfers pollen from one flower to another
传粉者
any invertebrate that lives in aquatic or damp habitats and has a soft unsegmented body, often covered with a shell
软体动物
a type of mollusk with a single, usually spirally coiled shell, a muscular foot, and a head with sensory tentacles and a mouth
腹足类
a fish that can not survive in salty waters and usually lives in lakes or rivers
淡水鱼
a fish that can survive in salty water and lives in oceans, also known as marine fish
咸水鱼