Rewilding Exotics From UK Zoos?

Recent captive breeding 'successes' carried out by London and Whipsnade Zoos, especially concerning animals presumed extinct in the wild, are to be applauded. However, an old Biological grump like me, has a number of reservations about such 'good news' stories (https://www.theguardian.com/environment/2023/may/14/london-zoo-team-save-doomed-species-rewilding-socorro-dove-wild). A first complaint, is the claim that a Socorro dove has been 'born' in captivity. It's nitpicking but birds are generally 'hatched' from eggs! There's then speculation around genetical tests on feather samples, to reveal whether the fledgling is male or female (as in my above illustration on Moorhen samples). The main genetic consideration, however, must be the inevitable serious impoverishment of diversity in zoo population(s). This will make it extraordinarily difficult to successfully 'rewild' these animals. Coping with diverse challenges, in the wild, will be very hard without flexibility. An additional consideration is especially well-illustrated by the article's second example. Three species of Mexican pupfish are extinct in the wild, because the natural springs, where they lived, have been destroyed (by agriculture etc). There's consequently no longer a natural environment, in Mexico, to 'rewild' these zoo-reared fish (or their eggs) into! In a sense, breeding terminally-endangered animals in a zoo, is the (relatively) easy bit. Finding locations and identifying successful reintroduction strategies (especially with tiny numbers of inbred animals) will be very much harder (if not, impossible). These problems will also be compounded by climate change. Habitats will have changed, since the animals were taken into captivity.