Imagine for a moment that you travel on all fours like other self-respecting quadrupeds. Extend your imagination yet a little more, and with it your body, so that a large dome-shaped shell-like structure extends out to cover you in all directions.
From above, a predator would see only a disk with a snug fit to the ground on all sides. Now shrink dramatically and move into the nearest fast-flowing stream: you are well on your way to becoming a water penny beetle larva. » Continue Reading.