Youtor
最原始的卵生哺乳动物：鸭嘴兽
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=YP45KTFXut0
The most primitive oviparous mammal: platypus • I believe everyone knows that almost all mammals are viviparous. The so-called October pregnancy and lactation are the signs of most mammals. This is also the evolution of mammals over hundreds of millions of years in order to improve the survival rate of offspring. • Of course, there are exceptions to everything. Platypus is one of the few oviparous mammals on the planet that lays eggs and breastfeeds, and is poisonous. • After people discovered them, it almost subverted scientists' impression of mammals, and at one time they thought it was a prank. • In fact, they have lived on the earth for tens of thousands of years, and they are only distributed in Australia. They are one of Australia's mascots. They also have their designs on the 20-cent coin. • An adult platypus is about 40-50 cm long and weighs about 700-2400 grams. The most curious thing is their mouths, which look like two plastic masks. Although they are somewhat similar to ducks, they are the only ones in the world that have such a long, wide, flat and flat mouth shell. • Studies have found that their toxicity is very special. Although both female and male platypus have spikes hidden in their heels, only male platypuses can secrete venom. Their toxicity is fatal to small animals, but not fatal to humans, but It can cause pain and redness for months. • What makes people feel most surprising is that their stings are not used for defense and food, but for competing for mates, which is really surprising. • Would you like such an ugly platypus? • #Mammal #Oviparous mammals
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