There has never been more than one species of platypus (except for a prehistoric platypus as shown by fossil remains). Platypuses in the north, like the koala, are smaller than their southern counterparts, but they are still a single species.
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4 species, around 20,000,000
There are many species, some more common than others. The total warbler population has to be in the millions.
No. Early scientists who first examined the platypus assumed that, because it lays eggs, it was primitive. More advanced scientific methods since then have indicated that the platypus is not at all primitive, but highly developed. It is one of the earliest known species, and one which had hardly changed from its earlier form, but this does not mean it is "primitive".
More than one platypus is two or more platypuses. The plural is not 'platypi'.
No. Once mating is over, the platypus has nothing more to do with the female.
There is no animal even remotely like the platypus. While some may consider the echidna to be similar, as it is an egg-laying mammal (monotreme) like the platypus, there are many more ways in which echidnas and platypuses are different.
Yes, there are only three living monotreme species: the platypus and two species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea.
That would be the plural using Greek rules: both platypus and octopus are from Greek, and do not (as is commonly assumed) use the Latin plurals platypi and octopi.The correct English plural is either platypuses or the same word platypus (used as a group noun, like sheep or trout).
It means that there is no more left of that particular species. Like the dinosaurs became extinct, and stuff.
450 species of mammals, 300 species of lizards, 140species of snakes, 2 species of crocodiles, 2,000 species of bony sea fish, 180 species of fresh water fish, 100 species of sharks, 50 species of rays, 750 species of birds. kangaroo, koala, wombat, kookaburra, emu, platypus, echidna, galah, bilby, numbat, leadbeater's possum, bandicoot, lumholtz's tree-kangaroo, sea-lion, dugong, an many more.