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POPSGiant kangaroo 'hunted into extinction' There is evidence they were around when humans arrived. Until then they had no need for a defense against an 'efficient' predator. They are likened to a giant sloth. their size would have made them likely to have a long breeding cycle? and they would not have needed to be quick until humans turned up. Still...you had to be there.
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POPSWhat Killed the Mammoth What led to the late Pleistocene extinction of North American Megafauna? The old theory was hunting by the newly arrived human population. But now...
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POPSYes, there really are gay animals From Salon magazine, 1999. Research into "alternative sexual behavior" among animals. Apparently, it's much more prevalent than you might think. So much for homosexuality being "unnatural."