As with all food for the Zoo's animals, the meat comes from reputable USDA-inspected facilities. While it may seem somewhat unappetizing to us humans, feeding large carnivores this way is in line with the best available animal care science.
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Many animals at the Zoo receive whole prey in their diets. Reptiles, birds and smaller mammal species are fed whole prey including mice, rabbits and fish. African lions, cheetahs, vultures and other carnivores are fed portions of whole carcasses.
Most boids, pythons, vipers, colubrids, crotalids, and elapids are fed mouse pups, mice, chicks, hamsters, rats, guinea pigs, chickens, ducks, or rabbits. Frozen, thawed prey are usually used in zoos; thawing under refrigeration is recommended.
After an animal dies, a necropsy is done to determine a specific cause of death to list beyond simply euthanasia, and the results are added to the animal's permanent file. Once this testing is completed, the remains of the animal are cremated.
To meet our big cats' needs, we feed them three diet items: whole rabbits, which are a good substitute for the skin and organs of large prey; ground meat, representing the muscle tissue of a kill; and bones, which help our cats maintain strong jaw pressure and clean their teeth.
That captivity can be REALLY bad for both physical AND psychological health. And while zoos have been really helpful is saving endangered animals, it doesn't work out for certain species. For example, most large carnivores like lions and tigers that are bred in captivity die when released into the wild.
So what do zoos spend money on if not the animals? Staff salaries, animal maintenance and facilities costs are the obvious expenses, but there are others. For example, in 2021 the San Diego Zoo spent $15,084 on advertising, according to the zoo's financial statement.
What do zoos do when a large animal dies? They perform a necropsy – which can take all day for an animal as large as an elephant. They offer grief counseling for the staff. The remains are removed from the compound and cremated.
A lot of Zoo animals choose to go outside in the winter. Dens, heated rocks and other exhibit features help them stay comfortable, even in the rain and snow. The Zoo also has heated, indoor exhibits that keep animals (and visitors) warm on cold winter days.
How do they dispose off (sorry for language) a dead giraffe? Zoos often incinerate the bodies of dead animals, even very large ones, because they don't have space to bury them, and there may be concerns about parasites, disease, or drug residue in the body such that it would be a bad idea to let other animals eat it.