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She was also polydactyl, with an extra toe on each paw, and had an underdeveloped jaw and no teeth which caused her tongue to always hang out.

The investigation of polydactyl hands and the brains that control them is a test case for the advantages of researching the unusual.

When Jacinda Ardern became New Zealand’s new prime minister last month she also brought with her a polydactyl cat, named Paddles.

The cat was well-known for its polydactyl abnormality - she had extra claws that looked like thumbs.

"I, for one, welcome our polydactyl feline overlords," said another in response to Paddle's introductory tweet.