My toads often open and close their mouths - not as wide as a yawn (like when they shed) - when they are hungry and excited about eating. In general, I have noticed that my toads wiggle their toes and open and close their mouths when they are truly excited by their prey. As they get full, these behaviors stop. The toe-wiggling has been discussed in other threads and may stimulate their prey to move. The function of the "lip-smacking" is not obvious to me...





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