gregarious adj.群居的 【例】 My gregarious sister makes friends wherever she goes.
swarm n.(蜜蜂、蚂蚁等)群(throng, crowd, horde) flock n.羊群，(禽、畜等的)群 herd n.兽群，牧群 mammal n.哺乳动物 carnivore n.食肉动物
carnivorous adj.食肉类的 appetite n.食欲
herbivorous adj.食草的
omnivorous adj.杂食的，什么都吃的 predator n.掠夺者，食肉动物 predatory adj.掠夺的，食肉的 prey n.被掠食者，牺牲者
poikilotherm n.变温动物，冷血动物 rodent n.啮齿动物
scavenger n.清道夫，食腐动物 microbe n.微生物，细菌 reptile n.爬虫动物 homotherm n.恒温动物 primate n.灵长类的动物 primates n.灵长类 mollusk n.软体动物
coelenterate n.腔肠动物 vertebrate n.脊椎动物 invertebrate n.无脊椎动物 finch n.鸣禽
【例】 This kind of birdseed is perfect for all
kinds of finches. bird n.鸟
fowl n.鸡;家禽(chicken; poultry) monster n.怪物，巨兽(demon) hordes n.昆虫群 insect n.昆虫 worm n.虫，蠕虫 beast n.兽，畜牲
aquatic adj.水的，水上的，水生的，水栖的 amphibian adj.两栖类的，水陆两用的 migrate vi.(鸟类的)迁徙 【例】 Some birds migrate to find warmer weather. graze v.放牧
【例】 This field will graze 30 head of cattle. gasp v.气喘，喘息(breathe, gulp)
【例】 The terrible scene made me gasp. peck v.啄，啄起(bite, nibble)
【例】 Woodpeckers pecked wood for a pest. trot vi./n.(马)小跑，慢跑(jog)
【例】 The horses trotted along the road. dormant adj.休眠的(inactive) 【例】 The dormant volcano has not erupted for two hundred years.
offspring n.子孙，后代(descendant) spawn n./v.产卵(generate, produce) pregnant adj.怀孕的，孕育的 hatch v.孵出，孵(卵)(incubate, breed, emerge from the egg)
【例】 Dont count your chickens before they are hatched.
breed v.(使)繁殖，教养，抚养
【例】 Many animals breed in the spring. domesticate vt.驯养，教化(tame)
【例】 No one has ever been able to domesticate the African elephant. fertilize vt.使受精
regeneration n.再生，重建 reproduce v.繁殖，再生
【例】 Birds reproduce by laying eggs. squeak vi.(老鼠或物体)吱吱
【例】 Rats squeak while flies buzz. It is quite a house.
chirp vi.喳喳(虫和鸟的叫声)
【例】 The injured bird did not move or chirp. hibernate v.冬眠
【例】 Polar bear can hibernate for a long time. camouflage v./n.伪装
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