Like
jjohnwm
said most of the time it's from pollution of some sort that has made them extinct or endangered in the first place. That hinders the reintroduction unless someone has made an effort to fix the issue.
Axolotls fall in to the pollution catagory. Good thing hobbyists have mostly figured out how to care for them properly and breed them.
Axolotls fall in to the pollution catagory. Good thing hobbyists have mostly figured out how to care for them properly and breed them.

