all the Canadian nature boffins say this is a very rare thing to happen – this I agree with as I read a lot of natural history news and if people get bit / eaten by creatures I tend to learn about it fairly soon.
Here in England the worst I have had to encounter in recent times is feeling something tugging at my leg and looking down to find a Cavalier King Charles Spaniel which had randomly got in the office, after playing with it for five minutes started wondering what on earth I was going to do with it (I didn’t want to turn it in to the dog warden as the kennels aren’t very nice places…)
Eventually it went back out of the door so I checked where it went to ensure it was safe, and it found its way back to its grateful owners in a neighbouring building..
