easy - cat - 猫
easy - dog - 狗
easy - fish - 鱼
easy - bird - 鸟
easy - pig - 猪
easy - cow - 牛
easy - horse - 马
easy - chicken - 鸡
easy - duck - 鸭子
easy - rabbit - 兔子
easy - mouse - 老鼠
easy - elephant - 大象
easy - lion - 狮子
easy - tiger - 老虎
easy - bear - 熊
easy - monkey - 猴子
easy - panda - 熊猫
easy - sheep - 羊
easy - goat - 山羊
easy - frog - 青蛙
easy - snake - 蛇
easy - turtle - 乌龟
easy - bee - 蜜蜂
easy - butterfly - 蝴蝶
easy - ant - 蚂蚁
easy - spider - 蜘蛛
easy - wolf - 狼
easy - fox - 狐狸
easy - deer - 鹿
easy - giraffe - 长颈鹿
easy - zebra - 斑马
easy - penguin - 企鹅
easy - dolphin - 海豚
easy - whale - 鲸鱼
easy - shark - 鲨鱼
easy - crab - 螃蟹
easy - octopus - 章鱼
easy - starfish - 海星
easy - goldfish - 金鱼
easy - parrot - 鹦鹉
easy - owl - 猫头鹰
easy - eagle - 老鹰
easy - swan - 天鹅
easy - peacock - 孔雀
easy - rooster - 公鸡
easy - turkey - 火鸡
easy - goose - 鹅
easy - camel - 骆驼
easy - kangaroo - 袋鼠
easy - koala - 考拉
easy - squirrel - 松鼠
easy - hedgehog - 刺猬
easy - bat - 蝙蝠
easy - seal - 海豹
easy - otter - 水獭
easy - beaver - 海狸
easy - raccoon - 浣熊
easy - hamster - 仓鼠
easy - guinea pig - 豚鼠
easy - donkey - 驴
easy - mule - 骡子
easy - buffalo - 水牛
easy - ox - 公牛
easy - bull - 公牛
easy - cheetah - 猎豹
easy - leopard - 豹子
easy - jaguar - 美洲豹
easy - hyena - 鬣狗
medium - rhinoceros - 犀牛
medium - hippopotamus - 河马
medium - crocodile - 鳄鱼
medium - alligator - 短吻鳄
medium - lizard - 蜥蜴
medium - iguana - 鬣蜥
medium - chameleon - 变色龙
medium - salamander - 蝾螈
medium - toad - 蟾蜍
medium - jellyfish - 水母
medium - seahorse - 海马
medium - squid - 鱿鱼
medium - lobster - 龙虾
medium - shrimp - 虾
medium - clam - 蛤蜊
medium - oyster - 牡蛎
medium - mussel - 贻贝
medium - snail - 蜗牛
medium - slug - 鼻涕虫
medium - earthworm - 蚯蚓
medium - centipede - 蜈蚣
medium - millipede - 马陆
medium - scorpion - 蝎子
medium - dragonfly - 蜻蜓
medium - grasshopper - 蚱蜢
medium - cricket - 蟋蟀
medium - mantis - 螳螂
medium - ladybug - 瓢虫
medium - firefly - 萤火虫
medium - mosquito - 蚊子
medium - fly - 苍蝇
medium - wasp - 黄蜂
medium - hornet - 大黄蜂
medium - termite - 白蚁
medium - cockroach - 蟑螂
medium - beetle - 甲虫
medium - moth - 飞蛾
medium - caterpillar - 毛毛虫
medium - cocoon - 茧
medium - pupa - 蛹
medium - larva - 幼虫
medium - tadpole - 蝌蚪
medium - flamingo - 火烈鸟
medium - pelican - 鹈鹕
medium - heron - 苍鹭
medium - crane - 鹤
medium - stork - 鹳
medium - seagull - 海鸥
medium - albatross - 信天翁
medium - sparrow - 麻雀
medium - swallow - 燕子
medium - robin - 知更鸟
medium - crow - 乌鸦
medium - raven - 渡鸦
medium - magpie - 喜鹊
medium - woodpecker - 啄木鸟
medium - hummingbird - 蜂鸟
medium - kingfisher - 翠鸟
medium - pigeon - 鸽子
medium - dove - 鸽子
medium - quail - 鹌鹑
medium - pheasant - 野鸡
medium - ostrich - 鸵鸟
medium - emu - 鸸鹋
medium - kiwi - 几维鸟
medium - porcupine - 豪猪
medium - armadillo - 犰狳
medium - anteater - 食蚁兽
medium - sloth - 树懒
medium - lemur - 狐猴
medium - baboon - 狒狒
medium - gorilla - 大猩猩
medium - chimpanzee - 黑猩猩
medium - orangutan - 猩猩
medium - gibbon - 长臂猿
hard - platypus - 鸭嘴兽
hard - echidna - 针鼹
hard - wombat - 袋熊
hard - wallaby - 小袋鼠
hard - tasmanian devil - 袋獾
hard - dingo - 澳洲野犬
hard - meerkat - 狐獴
hard - mongoose - 獴
hard - ferret - 雪貂
hard - weasel - 黄鼠狼
hard - mink - 貂
hard - badger - 獾
hard - wolverine - 狼獾
hard - lynx - 猞猁
hard - bobcat - 短尾猫
hard - ocelot - 豹猫
hard - serval - 薮猫
hard - caracal - 狞猫
hard - puma - 美洲狮
hard - cougar - 美洲狮
hard - panther - 黑豹
hard - snow leopard - 雪豹
hard - clouded leopard - 云豹
hard - okapi - 霍加狓
hard - tapir - 貘
hard - aardvark - 土豚
hard - pangolin - 穿山甲
hard - manatee - 海牛
hard - dugong - 儒艮
hard - walrus - 海象
hard - narwhal - 独角鲸
hard - beluga - 白鲸
hard - orca - 虎鲸
hard - porpoise - 鼠海豚
hard - barracuda - 梭鱼
hard - stingray - 黄貂鱼
hard - manta ray - 蝠鲼
hard - moray eel - 海鳗
hard - pike - 梭子鱼
hard - sturgeon - 鲟鱼
hard - salmon - 三文鱼
hard - trout - 鳟鱼
hard - bass - 鲈鱼
hard - perch - 鲈鱼
hard - carp - 鲤鱼
hard - catfish - 鲶鱼
hard - anchovy - 凤尾鱼
hard - sardine - 沙丁鱼
hard - herring - 鲱鱼
hard - mackerel - 鲭鱼
hard - tuna - 金枪鱼
hard - swordfish - 剑鱼
hard - marlin - 枪鱼
hard - sailfish - 旗鱼
hard - pufferfish - 河豚
hard - angelfish - 神仙鱼
hard - clownfish - 小丑鱼
hard - grouper - 石斑鱼
hard - snapper - 笛鲷
hard - flounder - 比目鱼
hard - halibut - 大比目鱼
hard - sole - 鳎鱼
hard - turbot - 大菱鲆
hard - vulture - 秃鹫
hard - condor - 秃鹰
hard - falcon - 猎鹰
hard - hawk - 鹰
hard - kite - 鸢
hard - buzzard - 秃鹰
hard - osprey - 鱼鹰
hard - kestrel - 茶隼
hard - merlin - 灰背隼
hard - harrier - 鹞
hard - goshawk - 苍鹰
hard - sparrowhawk - 雀鹰
hard - kookaburra - 笑翠鸟
hard - toucan - 巨嘴鸟
hard - hornbill - 犀鸟
hard - hoopoe - 戴胜
hard - cockatoo - 凤头鹦鹉
hard - macaw - 金刚鹦鹉
hard - parakeet - 长尾小鹦鹉
hard - budgerigar - 虎皮鹦鹉
hard - lovebird - 情侣鹦鹉
hard - canary - 金丝雀
hard - finch - 雀
hard - warbler - 莺
hard - thrush - 鸫
hard - nightingale - 夜莺
hard - lark - 云雀
hard - starling - 椋鸟
hard - mynah - 八哥
hard - oriole - 黄鹂
hard - tanager - 唐纳雀
hard - cardinal - 红雀
hard - bluejay - 蓝松鸦
hard - nuthatch - 五子雀
hard - chickadee - 山雀
hard - titmouse - 山雀