
Wild in Captivity, an article at Outdoor Photographer by Melissa Groo, is about the ethics of photographing wild animals in captivity.
The bottom line? You should not pay to photograph animals at places that exploit and mistreat the animals in their care. How do you know which places don’t mistreat or exploit animals? For starters check out the accredited lists at the AZA and the GFSA (links below).
Link
Wild in Captivity? at Outdoor Photographer magazine
Association of Zoos and Aquariums (AZA)
Global Federation of Animal Sanctuaries (GFSA)