https://blogs.scientificamerican.com/extinction-countdown/saving-california-condors-with-a-chisel-and-hand-puppets/

Sometimes saving a species from extinction requires a helping hand—or a jailbreak.

That may sound like a mixed metaphor, but it’s actually the case for critically endangered California condors (Gymnogyps californianus), North America’s largest birds. Every once in a while, a condor chick needs a little help getting out of its egg, and human caretakers need to step in to gently assist it on its journey out of the shell.