Some tips:
- For nocturnal animals, the key is coming when staff members are working in the exhibit. Even the sleepiest animals usually come out to check what is going on and whether there is some snack for them. Try visiting this exhibit first time in the morning, or hang around whenever staff is working in a nearby exhibit, or come back time and again.
- For birds in large aviaries and greenhouses, don't try too much to spot them, but hang near feeding stations, usually 30 min is sufficient.
- If you see staff around the exhibit, politely ask about your animal. However, be polite, and ask at the information point or the likely staff member - a hoofstock keeper usually knows nothing about birds in the bird house in the other part of the zoo. It is not uncommon that the animal has died, or is temporarily out of exhibit, and a name plate can hang for quite a long time afterwards.
Nevertheless, finding all species in a large zoo can require a real detective work - if you already know all the big mammals but are interested in small mammals, birds or reptiles.