This prickly butthead is Jumanji, she/he visits every night to eat all the cat food and, if you're stupid enough to be sitting outside with your shoes off, attack your -worms- toes.
Usually we just greet each other of an evening, however the last couple of visits I've noticed she has something around her neck, it's like blue plastic. It isn't stopping her eating or behaving normally - yet. But ideally I'd like to get it off of her.
Unfortunately she is very fast (hedgehogs can run and it's hilarious) and I don't have a trap.
Any ideas? She's sat opposite me munching a slug at the moment so I don't think she's is imminent danger.