alt Hacker News"in the wild" might be doing a lot of heavy lifting, or it may be based on subspecies or similar.
I don't really expect to find endangered species at the local pet store.
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It's a similar story for Venus fly trap plants. It has a tiny habitat so it's exotic. They're easy to breed so it's cheap to start selling them. But their limited habitat is being destroyed, so they are endangered and also on the clearance rack at the garden store.
Why not. We found plenty of endagered species at zoos. They are endangered not only as a function of the number of species, but due to their vanishing environments.
It's a very strange definition. Would you consider domestic chickens "endangered"? Clearly if there are many kept in captivity and bred, there's little chance of them becoming extinct even if there are nearly none in the wild.
I have three axolotl's in the next room, there are no subspecies to my knowledge, except maybe for some cross breeding with Salamanders in the US.
They are common in scientific research as they have amazing regenerative abilities; they will often mistakenly bite each other's legs off as juveniles (they are not the smartest creatures) and then grow them back in a few weeks, good as new. They made it into the exotic pet trade and now they are quite common in captivity, but now critically endangered in the wild. There are attempts to breed and repopulate them, with some limited success.
Another interesting thing, in many countries and states it is legal to keep an axolotl and illegal to keep a Salamander.
They are actually fairly easy to keep in my experience, with two caveats. 1) you need to be able to keep the water below 24 Deg C, this means spending some money on chillers even in sub-tropical countries. 2) If you have a pair in the same tank (regardless of sexing) you need to be prepared to cull the eggs! (freeze them) Prices here went from ~$50NZ each down to around $10-15 each due to the Minecraft craze.