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At Taronga Zoo Sydney, vets face high-risk odds putting 22-year-old sea lion Murphy under anaesthetic for vital eye surgery, while keepers test the chimpanzees' wits with a challenging new puzzle feeder.

At Western Plains Zoo, keepers test cheetahs in high-speed fitness trials, while Sydney staff take on fresh roles assessing young crocodiles and guiding an ageing otter through daily mobility exercises.