It also involved the reintroduction of locally extinct species like the pink pigeon and the echo parakeet, both considered vulnerable and globally threatened.
According to the Association for Zoos and Aquariums website, there are approximately 8700 species represented in zoos around the world and just 117 reintroduction programs.
KAFANOV (voice-over): In Colorado, the wolf reintroduction proposition barely passed, with most of the votes in favor of reintroduction coming from urban areas like Denver and Boulder.
Starting with only 60 of those snails, Gerardo's team has since bred and released more than 100,000, one of the biggest wildlife reintroductions in history.
So, I'm all for the reintroduction, a reinfusion of joy into our public spaces, because I think it's part of what we're trying to achieve in terms of reinvigorating our communal rituals and our communal life.
So it was an appropriate and good thing to bring them into captivity, to try to breed them, have a reintroduction program, if we care about protecting biodiversity.
Thanks to the first ever voter-mandated reintroduction of endangered wolves in U.S. history, these wolves, captured in Oregon, were set free in Colorado's wilderness last December.
Mr Biden didn’t say what those measures were, but they almost certainly include the reintroduction of a ban on so-called assault weapons as well as a more comprehensive system of background checks on those purchasing guns.
It's almost making me wonder if part of the effect might actually be a reintroduction of C-15 as part of that, just, you know, without really thinking that's what's happening.