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by mannykannot 2987 days ago
IIRC, the full video (or a different one showing a crab killing a Booby - I can't find it at the moment) first shows the crab climbing a tree, approaching a sleeping bird, and breaking one of its wings. The bird falls out of the tree, and the crab climbs down the tree to attack the bird again on the ground.

This behavior might be seen as an extension of how they go after coconuts and other fruit.

https://en.wikipedia.org/wiki/Coconut_crab#Ecology