This might be the least paranormal topic on this forum, but hear me out: there are definitely wallabies living wild in parts of Britain. Not explained. Not fully documented. Not catalogued by official wildlife authorities.
I've got personal experience with this - saw one (definitely not a rabbit, definitely not a deer) in a field near Ashford in Kent about three years back. Reported it to the council, got told I was barmy.
But there's a whole hidden population somewhere, and I'm interested in tracking sightings. Anyone got photos or encounters?