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Fig. 1. The three types of gaping categorised in this study. Type I was ascribed to situations when the mouth was visibly, but barely, open (i.e. there was no obvious sealing of the upper jaw with the lower jaw), which is readily distinguished from a normal closed mouth. Type II was ascribed to situations when the mouth was obviously open by more than a few millimetres. Type III was easily distinguished from other types as the lizard's tongue was easily visible and the throat was obviously distended due to the open mouth.





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