This link is somewhat relevant: http://en.wikipedia.org/wiki/Mautam http://en.wikipedia.org/wiki/Mautam In India there's a species of bamboo that flowers every

This link is somewhat relevant: http://en.wikipedia.org/wiki/Mautam http://en.wikipedia.org/wiki/Mautam In India there's a species of bamboo that flowers every 48 years; during each flowering, the rat population explodes. Once they've eaten all the bamboo, they turn to anything else they can find.