This zoo has been reducing the number and animal species for years, it's very costly to upgrade and rebuild exhibits and the collection reflects those challenges.This news is a shame. I wasn't overly impressed by Philadelphia Zoo when I visited, but one real highlight was the reptile house, which is saying something since reptile houses aren't usually my cup of tea. I was especially impressed with the diversity of rattlesnake species the zoo had on display. It'll be a big loss if these snakes are no longer kept by the zoo, although their could be an upside to this: we don't know what the zoo is planning to replace the venomous snakes with.
Also, caring for certain species, such as elephants and venomous reptiles is a specialty skill that warrants more training and certification. Only a handful of staff can care for these species. This certification also grants these keepers a higher wage. Removing these species from the collection reduces salaries and in theory, will allow for the flexibility of any keeper to be able to move about and work in any animal building on site.