![]() ![]() A male platypus has the pattern XYXYXYXYXY, while a female has ten Xs. Unlike all other mammals, which have two sex chromosomes (X and Y XX for females, XY for males, with rare exceptions), the platypus has ten. (By Jason Edwards, via: How Stuff Works )Īnd speaking of breeding, reproduction in platypuses isn’t exactly ‘mammal standard’, either. Why your dog and your platypus shouldn’t play together. ![]() One of only a very few venomous mammals, the male’s venom production increases during the breeding season, suggesting its purpose may lie in competition with other males. ![]() While it isn’t enough to take out a human, it does cause severe, incapacitating pain whose after-effects can last for months. Male platypuses have a spur on each hind foot which is filled with a venom powerful enough to kill a large dog.
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