Geckos Are Largest Animals Capable of Sticking to Walls

Spider-Man's ability to scale vertical walls may help the web-slinger catch the bad guys in comic books, but he could never pull this trick off in reality, according to scientists in the UK.  A new study by zoologists at the University of Cambridge has found that geckos are the largest animals capable of sticking to smooth vertical surfaces – an ability that requires increasingly larger adhesive footpads as a percentage of overall body surface as animals themselves become bigger.
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