After 20 years away, giant panda Ya Ya returned home on Thursday to a warm welcome and an outpouring of affection from millions of her online and in-person fans.

Shanghai's giant panda Ya Ya is back home, after 20 years in US

It's no surprise sheep can recognise people ? their intelligence is often overlooked

Sheep can recognise celebrities from photographs

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Shanghai's giant panda Ya Ya is back home, after 20 years in US

Sheep can recognise celebrities from photographs