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lounge lizard , and perhaps other reptiles , may be more clever than we realize . In a new study , tropical lizard machinate creative ways to get at a hidden treat of beat larvae , remembered them and adapted what they ’d learned to go on snag these babe - germ snacks .
" This is one more piece of the teaser that can help us understandthe evolution of cognitive ability , " said Duke University behavioural ecologist Manuel Leal , the lead research worker of the study . " We jazz a lot free-base on studies of bird and mammalian , but there have been few studies on reptiles in oecumenical . "
Lizards found ways to get at a hidden insect larva treat, indicating that they, and perhaps reptiles in general, may learn relatively quickly.
elastic behavior — behavior that can be adapted to fulfil a special situation — is associate with higher - storey cognitive power ; in other words , more smarts . scientist have believe animalswith complex societal structuresor with change dieting develop more flexibility , and possibly high - tier cognitive abilities , through evolution .
Most lizard , however , are territorial dwellers that live alone and munch on the same food year around , mostly insects , so it has been assumed that they , like other reptile , have specify mastermind might and comparatively pay back doings . [ 10 beast That Use Tools ]
Leal and his colleagues give sixAnolis evermannilizards from Puerto Rico a challenge : Snatch a dead louse larva hidden under a distinctively colored charge card disk . Four of the six lizard machinate ways to slay the kickshaw . [ See the video ]
" Individuals work out this problem in dissimilar path , " Leal said . " Some will bite the boundary of the magnetic disk . Others will use their snoot as a lever . "
When other disks of clearly dissimilar gloss were introduced , the four lizards continue to concentrate on the phonograph recording they were familiar with , most likely homing in on the colour . ( Lizards ' colour vision is keener than our own . )
Then the researchers put the kickshaw under one of the other disks , two of the lizards figured out this substitution and keep to locate the treats .
The lizard ' performance was comparable to snort in similar studies , the researchers said , with one notable difference . Birds would do the chore multiple clip in a day , but because lizard are cold full-blooded and do n’t get athirst as often , they finish only one trial per daytime — mean that they had to remember their disk tricks from one 24-hour interval to the next .
The lizard ' public presentation show that they , and perhaps reptiles in worldwide , can learn comparatively quickly , though they are slower moving thanwarm - blooded animals like birds . It also indicates that factors other than complex social social structure and a various dieting may influence the evolution of flexible behaviour and more sophisticated cognitive ability , Leal enjoin .
In looking at the organic evolution of cognition , scientists also need to seem at other groups , like reptilian and fish , he say .
The subject by Leal and Brian Powell , also of Duke University , is detailed this week in the Journal of the Royal Society : Biology Letters .
