I would visit a well-run zoo - you can, of course, check them out online to find out their 'mission statement' on conservation.
Bristol Zoo is supposed to fund wonderful conservation projects but their lions are kept in a very small enclosure and get distressed by late night events held there.
Two sides to the story:
www.peta.org.uk/blog/bristol-zoo-parties-lion-stress/
www.bristolzoo.org.uk/save-wildlife/conservation-and-research
Water Pollution -“ A National Disgrace”? A case for renationalisation?