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"Officials talk about the zoo as an entertainment centre rather than a zoological garden. The real goals of modern zoos are completely overlooked."

It’s home to the largest urban zoological garden in America, a park system nearly 10 times the size of Manhattan’s Central Park — and the city’s last remaining patch of old growth forest.

One study found that out of 19 white lion cubs bred at a zoological garden in Italy, four were stillborn and another 13 didn’t survive the first month.

The annual stocktake is required for the zoological gardens' licence.

During its first decades, the zoological gardens remained relatively exclusive, as its fellows mulled over the peculiar physiology, morphology and behaviour of inmates such as a chimpanzee that they named Tommy.