It’s been a wormy, sexual head-scratcher for years. The Japanese green syllid worm Megasyllis nipponica detaches its butt in order to reproduce. But how do these algae-eating invertebrates do ...

ST. PETERSBURG, Fla. — Every spring, little green inchworms start to appear, seemingly floating in the air beneath the trees. They don’t live in the sky, but drop from the trees “when ...