Does a platypus lay eggs2/20/2023 There are some viviparous reptiles, however, particularly snakes. Viviparous reptiles: the vast majority of reptiles are oviparous. These animals birth their young in eggs, but they do also feed them milk. Oviparous mammals are restricted to the group called monotremes and include the platypus and the echidna. What are viviparous animals?Īs we stated, viviparous animals are some of the most evolved and include: Viviparous mammals: almost all mammalian mammals are viviparous. Viviparous animals can be divided into some groups: 1) placental viviparity (this is like with humans and dogs, the mother has something that connects her body to her baby. Generally these are mammals, but also some sharks and fish and insects and snakes don’t lay eggs either. Are there any animals that don’t lay eggs? If there is no male iguana, she will still lay eggs, but they won’t be fertile. Female iguanas usually lay a clutch of eggs every year once they’re mature. There are some reptiles that do not lay eggs, but they are very rare. Are there any reptiles that do not lay eggs? Mammals like cat, dog and man are viviparous animals. Animals which reproduce by giving birth to their young ones are called viviparous animals. Birds, insects, reptiles and fishes are oviparous animals. Which of the following is a viviparous animal?Īnswer: Animals which reproduce by laying eggs are called oviparous animals. Some groups of snakes and lizards give birth to live young, however. Reptiles: most snakes and lizards lay eggs, as do all crocodilians, turtles and tuataras. Only monotremes (echidnas and platypuses) do. Mammals: therians (placentals and marsupials) do not lay eggs. Why are there no viviparous species in birds?. Why is the transition period important in viviparous mammals?.Is the duck-billed platypus a mammal that lays eggs?.Which of the following mammals is an oviparous mammal?.Why do some reptiles lay soft eggs and some don’t?.Are there any animals that don’t lay eggs?.Are there any reptiles that do not lay eggs?.Which of the following is a viviparous animal?.William Caldwell was sent to Australia in 1883, with substantial financial backing from the University of Cambridge, the Royal Society and the British Government, to resolve the long-standing mystery. The newly discovered collection includes echidnas, platypuses and marsupials at varying life stages from fertilised egg to adolescence. He added: “Lizards and frogs lay eggs, so the idea of a mammal laying eggs was dismissed by many people, I think they felt it was degrading to be related to animals that they considered ‘lower life forms’.” Mr Ashby said: “In the 19th century, many conservative scientists didn’t want to believe that an egg-laying mammal could exist, because this would support the theory of evolution, the idea that one animal group was capable of changing into another.” The question of whether some mammals lay eggs then became hotly debated in scientific circles.Įxperts say the newly discovered collection of little jars represents the huge scientific endeavour that went into solving this mystery. Until Europeans first encountered platypuses and echidnas, spiny anteaters, in the 1790s, it had been assumed that all mammals gave birth to live young. Three months after Mr Ashby asked Collections Manager Mathew Lowe to keep an eye out, a small box of specimens was found in the museum with a note suggesting they were Caldwell’s, and Mr Ashby’s investigations confirmed this was the case. Mr Ashby added: “I knew from experience that there isn’t a natural history collection on Earth that actually has a comprehensive catalogue of everything in it, and I suspected that Caldwell’s specimens really ought to be here.” “But to have the physical specimens here, tying us back to that discovery almost 150 years ago, is pretty amazing.” He said: “It’s one thing to read the 19th century announcements that platypuses and echidnas actually lay eggs. It was discovered when Jack Ashby, assistant director at the museum, was doing research for a new book on Australian mammals.
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