While reading the book Artificial Intelligence: A Modern Approach i came across this statement:
Consider the lowly dung beetle. After digging its nest and laying its eggs, it fetches a ball of dung from a nearby heap to plug the entrance. If the ball of dung is removed from its grasp en route, the beetle continues its task and pantomimes plugging the nest with the nonexistent dung ball, never noticing that it is missing
However i wasn't able to find any evidence for this statement, only some Blogs quoting the book. Can anybody tell me whether this is actually true?