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They now plan to study the two echidna species to see if they use the same system. So what is the advantage of having so many sex.

The platypus isn't just weird for being duck-billed, venomous and a mammal that lays eggs—it has weird genetics too. Most mammals have two.

Little is known about the gene content of the 10 platypus sex chromosomes, but and snakes (the latter having an unrelated ZZ:ZW system) (Matsubara et al. Given the ubiquity of this mode of reproduction, in particular among animals, one might think that dioecy — having separate males and females —.