DidyouknowthatEarthishometomillionsofanimals?Arecentsurveyshowsthatscientistshavefoundmorethan2millionkindsofanimalsandthereareover10millionwehaven'tdiscoveredyet.
Animalsaremuchmorethanfoodorpetsforhumans.Animalsaresmart.Someofthemdoveryunusualthings.Researchshowsthatanimalscanusetools.Forexample,chimpanzeesusestickstogetwhiteantsoutoftheground.Theyeventeacheachotherhowtousetools.
Scientistsfindthatanimalshavetheirownwaystocommunicate.Didyouknowdophinsuseultrasound(超声)tocommunicate?Birdslearntosingfromtheirparents.Theyalsolearntotellthedifferencebetweenthesoundoftheirowngroupandthoseofothergroups.
Animalshavesocietiestoo.Let'stakeantsasanexample.Anantfamilyusuallycontainsmillionsofants.Someantsarestrongenoughtofightagainstenemies.Sometakecareofbabies.Othersgolookingforfood.Theyhaveorganizationsthatmakethegroupworkwell.
Animalscanhelphumansinmanyways.Longago,peopleusedpigeonstosendmailoverlongdistances.Dogshavebeenbestfriendstohumanssinceancienttimes.Nowadayssomedogsareeventrainedtoguideblindpeople.Dogsalsousetheirnosestosearchoutdrugsforthepolice.
Morethan10millionkindsofanimalshavebeenfound.
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Animalscanbefoodorpetsforhumans.
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T
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Animalsaresmart,soallofthemcandoveryunusualthings.
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Chimpanzeescangetwhiteantsoutofthegroundbyusingbrushes.
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Someantsarenotstrongenoughtofightagainstenemies.
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Pigeonsareeventrainedtoguideblindpeople.
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Dogshavekeennoses,sotheysometimeshelpthepolicesearchoutdrugs.
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