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Hanna

Mythbusters did an episode on finger print locks many years ago. You could probably find it on Youtube. Bullet ants are named after the pain then can inflict, if I recall correctly. A bite from one being compared to the pain of a gunshot. Some ants really do build bridges and rafts. Possibly the fire ants.

Kris

If I remeber correctly water surface tension at small scales prevents it from flowing apart. That's why you can have tiny water beads on surfaces that don't endlessly flow apart. But it also affects other things like insects when small enough insects submerge they can keep tiny pockets of air around them because of how water tension at that scale keeps it from filling the air pockets. So ants from the raft on the underside most likely had air pockets around them. There are a lot of insects that can do this.