动物的英语单词常见100个如下：
1.Mammals（哺乳动物）
Elephant, lion, tiger, bear, giraffe, wolf, monkey, dolphin, rhinoceros, kangaroo.
2.Birds（鸟类）
Eagle, peacock, swan, parrot, owl, penguin, flamingo, hummingbird, seagull, duck.
3.Reptiles（爬行动物）
Snake, crocodile, turtle, lizard, iguana, chameleon, alligator, tortoise, gecko, komodo dragon.
4.Amphibians（两栖动物）
Frog, toad, salamander, newt, axolotl, caecilian, tree frog, bullfrog, poison dart frog, mudpuppy.
5.Fish（鱼类）
Goldfish, shark, clownfish, angelfish, swordfish, tuna, salmon, catfish, pufferfish, guppy.
6.Insects（昆虫）
Butterfly, bee, ladybug, ant, grasshopper, dragonfly, mosquito, cockroach, moth, spider.
7.Arachnids（蛛形纲动物）
Spider, scorpion, tick, mite, harvestman, camel spider, daddy longlegs, black widow, brown recluse, tarantula.