But the people at Folly Wildlife Rescue know how rare it is to have someone like Polly in their midst. They have only ever had one squirrel like this before - and that was 10 years ago.
"Although unusual, they are seen from time to time," Risley said. "You often get them in a certain area."
Risley did speculate about what might have happened to bring the rare baby to his care. "People who pick these baby animals up, often leave them at the houses of individuals who are perhaps known for being animal lovers," he said. "But as we don't have any more information, can't know for sure."