As soon as the ice melts from ponds, wood frogs emerge from hibernation, filling cool spring nights with the sound of their croaks. To tell males from females, just look at their hands. Males have absurdly muscular thumbs, the better to hold onto females in the brief but fierce competition for mates.
Have you ever noticed tumor-like growths on plants? Fungi, insects, mites and bacteria are like “body snatchers,” penetrating plant cells and manipulating them to produce galls, cankers and witch’s brooms for the parasites’ benefit.