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Rats--and lots of them--are the subject of this comprehensive look at a global pest.
Description by WGBH Boston Video:
Every 48 years, the inhabitants of the remote Indian state of Mizoram suffer a horrendous ordeal known locally as mautam. An indigenous species of bamboo, blanketing 30 percent of Mizoram's 8,100 square miles, blooms only once every half-century, spurring an explosion in the black rat population that feeds off the bamboo's fruit. The rats run amok, destroying crops and precipitating a crippling famine throughout Mizoram. NOVA follows this gripping tale of nature's capacity to engender human suffering, and investigates the botanical mystery of why the bamboo flowers and why the rats attack with clockwork precision every half-century.