Low oxygen triggers moth molt

A new explanation for one of nature's most mysterious processes, the transformation of caterpillars into moths or butterflies, might best be described as breathless.

Evolution in reverse: insects recover lost 'wings'

The extravagant headgear of small bugs called treehoppers are in fact wing-like appendages that grew back 200 million years after evolution had supposedly cast them aside, according to a study published Thursday in Nature.

Cyborg-walkers stride toward Japan's robotics future

Three Japanese cyborg look-alikes turned heads on busy Tokyo streets and subway trains Monday as they made their way to a robotics conference on a hot summer's day -- without breaking a sweat.

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Exoskeleton

An exoskeleton is the external skeleton that supports and protects an animal's body, in contrast to the internal skeleton (endoskeleton) of, for example, a human. In popular usage, some of the larger kinds of exoskeletons are known as "shells". Examples of exoskeleton animals include insects such as grasshoppers and cockroaches, and crustaceans such as crabs and lobsters. The shells of the various groups of shelled mollusks, including those of snails, clams, tusk shells, chitons and nautilus, are also exoskeletons.

Mineralized exoskeletons first appeared in the fossil record about 550 million years ago, and their evolution is considered by some to have played a role in the subsequent Cambrian explosion of animals.[citation needed]

Some animals, such as the tortoise, have both an endoskeleton and an exoskeleton.

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