From “Life in the Undergrowth“, perhaps the finest insect documentary ever made, a scene featuring Australia’s intertidal ants:
A few years back I traveled through northern Queensland with myrmecologists Phil Ward and Gary Alpert. Having heard about the aquatic abilities of these ants, we searched for them in a mangrove forest just outside the Cairns airport while waiting for our flight. After a bit of looking, Phil found a foraging trail of large black ants going up a mangrove trunk.
We dropped a few into the water below, and sure enough- swimming ants! It’s a remarkable behavior.