Thanks to the half-moon shape of their heads, hammerhead worms are known by many names, including hammerhead flatworm, arrowhead flatworm, and broadhead planarian (a category of flathead worms).

This tiny wasp is natural pest control for the hornworm caterpillar, bane of summer gardeners. Tomato growers know the tobacco hornworm can destroy a plant overnight. But a tiny natural ally helps ...