Foxes, in my urban garden in Muswell Hill, North London, have taken the trouble to tear open stout wooden animal houses to get to the residents, with terminal consequences for my poor little mates: bantam hens, rabbits and, one Xmas, my incredibly large Aylesbury duck. The duck was carried away over a six foot fence and off through the woods at the back - my kids followed the trail (it had snowed and the drips of blood were clear). It led all the way to Hampstead Heath!!!