There's also this interesting and devastating phenomenon I read about a while ago: in some places where bamboo grows (IIRC, one or more of the north-eastern Ind

There's also this interesting and devastating phenomenon I read about a while ago: in some places where bamboo grows (IIRC, one or more of the north-eastern Indian states, like Assam, is one of them), there are periodic famines or at least great shortages of food, and hence human deaths or migration, due to rats breeding like mad due to bamboo's flowering (which the rats eat - could be flowers or seeds) or something, every some number of years, and then when the bamboo food is over, they invade human habitation to continue getting food. Not sure if it is a solved problem yet. Update: Just googled about it: https://en.wikipedia.org/wiki/Mautam https://en.wikipedia.org/wiki/Mautam