There are two basic life-cycle patterns among animals. Many animals have complex life cycles with two or more very distinct stages; metamorphosis is the usual term for the often-radical changes that ...

Ticks are small bugs that are related to spiders and have been on the earth for at least 90 million years. There are more than 800 kinds of ticks across the globe, but only two tick families can give ...

John E. Woodmansee Photo: Tobacco hornworm on a tomato plant that has been attacked by a parasitic Braconid wasp. The white capsules on its back are the pupal stage of the tiny wasp. Braconid larvae ...

A new article published in Proceedings of the National Academy of Sciences reveals the unprecedented ability for reverse development in a ctenophore, also called comb jelly. The findings suggest that ...

Reverse development in the ctenophore Mnemiopsis leidyi. (A) Experimental design for starved (above) and lobectomized (below) M. leidyi. (B) Imaging station to record morphometric changes over time.