TABASCO, Mexico – Heat-stressed, endangered howler monkeys are dropping out of trees and dying across Tabasco and Chiapas, Mexico, as the third relentless heat wave this season bakes the region. Conservation and rescue groups have made impassioned pleas for villagers to leave fresh water in the jungle for the heat-sickened primates. One group, COBIUS, reported "massive deaths." COBIUS told Reuters that at least 100 monkeys have died so far. Civil Protection officers said villagers have gathered the bodies in mass graves and covered them with lime for disposal, with few other options.