The Wonder of Resilin!

Resilin is found in arthropods, and is related to elastic. Unlike elastic, resilin is far more efficient. This can be extracted from the locust tendon, found in such insects as fleas. This enables them to jump 150 times their body length. The elastic efficiency is reported to be 97%, with a scant 3% being lost to heat. Due to its important use in insects, resilin can contract and expand millions of times. This wonder material was isolated in 2005. Now, scientists have been able to create this amazing substance artificially in the lab. Due to this, it has become much more practical.

links (there are quite a few on that page):
http://www.csiro.au/csiro/search/CSIROau.html?query=resilin&Go=Go&area=all