Photo: rizalis/Flickr
... the assassin bug’s width means it can pile them high, creating a mound of over twenty ‘shells’. The exoskeleton of ants is made of chitin, a particularly sturdy substance which can provide cover for the assassin bug for weeks.
The heap is stuck together by a sticky secretion. As it is usually larger than the bug itself, should another insect decide that the assassin would be good for its next meal it serves as a readymade getaway plan. The attacker goes for the larger part (the hollow exoskeletons) which are then simply shed, allowing the assassin bug to beat a hasty retreat.
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