用英语介绍一下动物的不同种类，要英文简介

Mammals(哺乳动物):Babymammalsarebornfromtheirmothersstomach.Anyofvariouswarm-bloodedvertebrateanimalsoftheclassMammalia,includinghumanbeings,characterizedbyacoveringofhairontheskinand,inthefemale,milk-producingmammaryglandsfornourishingtheyoung.Batsaretheonlyflyingmammal.ThebiggestmammalistheBlueWhale.

Example:people,dogs,elephants,etc.

Reptiles(爬行动物):Reptilesarecold-bloodedanimals.Babyanimalsarebornfromeggs.Anyofvariouscold-blooded,usuallyegg-layingvertebratesoftheclassReptilia,suchasasnake,lizard,crocodile,turtle,ordinosaur,havinganexternalcoveringofscalesorhornyplatesandbreathingbymeansoflungs.Theyusuallyhavescales.Example:snakes,frogs,lizards,etc.

Birds(鸟类):Birdsareanimalsthathavefeathersandwings,butnoteveryoneofthemcanfly.Theostrichisthebiggestbird.Birdseatbugs,fish,corn...Example:sparrows,flamingoes,chicken,ducks,etc.

Fish(鱼):Fishhavescales.Theyliveinwaterandcan'tleaveit.Theydon'thavelegsbutfinsandtailsinstead.Anyofnumerouscold-bloodedaquaticvertebratesofthesuperclassPisces,characteristicallyhavingfins,gills,andastreamlinedbodyandincludingspecifically:Example:clownfish,catfish,goldfish,etc.

Insects(昆虫):AnyofnumeroususuallysmallarthropodanimalsoftheclassInsecta,havinganadultstagecharacterizedbythreepairsoflegsandabodysegmentedintohead,thorax,andabdomenandusuallyhavingtwopairsofwings.Someinsectsprovidegooduseforfarmers.Insectsincludetheflies,crickets,mosquitoes,beetles,butterflies,andbees.

Theheaviestanimalonearth:Whales

Thetallestanimalonearth:Giraffe

Thefastestanimalonearth:Jaguars

Theslowestanimalonearth:Snails