Lions at London Zoo Celebrate World Lion Day in Style
The Zoological Society of London, which runs the zoo, is working on conservation efforts for the endangered Asiatic lions, to bolster numbers.
There are only 600 left in the wild.
ZSL's Mark Habben says the balls encourage lions "to use their incredible sense of smell to track it through their territory before using their sharp claws to tear into it - acting as a natural manicure for our lionesses."
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