There are other insects (and common outside Australia) that do this: Specifically, water boatmen which live underwater and have little legs that they use to pus

There are other insects (and common outside Australia) that do this: Specifically, water boatmen which live underwater and have little legs that they use to push themselves around with. This includes the "lesser boatman", Corixidae and Pleidae, and the "greater boatman", Notonectidae. In particular, Notonecta glauca (or common backswimmer) swims on its back and will walk under the water surface searching for prey: https://www.researchgate.net/figure/Lateral-view-on-the-water-bug-Notonecta-glauca_fig1_51697474 https://www.researchgate.net/figure/Lateral-view-on-the-wate....