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I picked up a large Rococo Toad about a month ago and I noticed while feeding him today that he was tapping the toes of his hind feet just like a dart frog would (only it's much louder and more noticeable when a giant toad does it). I'd never heard of this behavior outside of PDFs before and was wondering if others have observed it in different anurans?
 

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It's quite common in a number of anurans. In some (ike Ceratophrys) it may be a luring behaviour, but in most its probably a way to ensure that insect prey keeps moving.

See this paper:
Sloggett and Zeilstra (2008) 'Waving or tapping? Vibrational stimuli and the general function of toe twitching in frogs and toads (Amphibia: Anura)'

Waving or tapping? Vibrational stimuli and the general function of toe twitching in frogs and toads (Amphibia: Anura) 10.1016/j.anbehav.2008.08.005 : Animal Behaviour | ScienceDirect.com

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