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As one example on a physical rather than a chemical level, I read that marsupials are stuck for this reason. They need claws to climb into their mother's pouch
by plushpuffin 9y ago
As one example on a physical rather than a chemical level, I read that marsupials are stuck for this reason. They need claws to climb into their mother's pouch after birth, so there are certain ecological niches closed off to them. You'll never see a hoofed marsupial, for example.
- plushpuffin 9y agoFound a source: https://synapsida.blogspot.com/2011/11/why-marsupials-cant-fly.html https://synapsida.blogspot.com/2011/11/why-marsupials-cant-f...
- vanderZwan 9y agoI've heard that the cheetah is considered an evolutionary dead end as well, being so hyper-specialised for speed that they are unlikely to be able to keep up the arms race with their prey, nor able to evolve back out of this.