【Theideaforascienceexperimentcancomefromanunusualplace.AfterwatchingaYouTubevideoofadancingbirdnamedSnowballascientistinCaliforniadecidedtostudytheabilityofanimalstokeepthebeat.Birdlovershavelongclaime】

　　Theideaforascienceexperimentcancomefromanunusualplace.AfterwatchingaYouTubevideoofadancingbirdnamedSnowballascientistinCaliforniadecidedtostudytheabilityofanimalstokeepthebeat.

　　Birdlovershavelongclaimedthattheirpetshaverhythmandtherearemanyvideosofdancingbirdsonline.Untilnowscientistshavesuspectedthathumansaretheonlyanimalsthatcanaccuratelykeeprhythmwithmusic.

　　ThankstoSnowballthatscientificopinionischanging.Snowballisacockatooakindofparrotandhisfavoritesongis"Everybody"bytheBackstreetBoys.Whenhehearsthesonghemoveshisfeetandrockshisbodywiththetempoorpaceofthemusicasthoughheistheonlybirdmemberoftheboyband.

　　AniruddhPatelisaneuroscientistorascientistwhostudieshowthebrainandthenervoussystemcontributetolearningseeingandothermentalabilities.HeworksattheNeurosciencesInstituteinSanDiego.AfterseeingSnowball'sdanceonlinePatelvisitedthecockatooatthebirdrescuefacilityhe'scalledhomefortwoyears.Thescientistplayed"Everybody"forSnowballandalsoplayedversionsofthesongthatwerespeduporsloweddown.SometimesSnowballdancedtoofastortooslowly.OftenwhentherewasachangeintempoSnowballadjustedhisdancingtomatchtherhythm.Inotherexperimentsscientistshaveobservedthesameabilitiesinpreschoolchildren.

　　Patelisn'ttheonlyscientistwhohasstudiedSnowball'smoves.AdenaSchachnerwhostudiespsychologyatHarvardUniversityalsowantedtoknowmoreaboutthedancingbird.Schachner'steamplayeddifferentmusicalpiecesforSnowballandaparrotnamedAlexaswellaseighthumanvolunteers.Thescientistsobservedthatthebirdsandthehumanskepttimetothemusicwithaboutthesameaccuracy.

　　SchachnerandherteamwatchedthousandsofYouTubevideosofdifferentanimalsmovingtomusic.Notalltheanimalscoulddancehowever.Fromwatchingthevideosthescientistsobservedthatonlyanimalsthatimitatesoundsincluding14parrotspeciesandAsianelephantsaccuratelymovedintimetomusic.

　　63. Theunderlinedwords“thatscientificopinion”inthethirdparagraphreferstothetheorythat______.

　　A.birdslikeSnowballhavetheabilitytokeepthebeat