Glenisla, Angus: Damage by squirrels is common; the mustelid less so. Still, as a local told me, ‘you cannae blame them wanting somewhere to live’

That the thatch is thick with moss and crusted with the brittle fronds of lichen is not unusual for a roof of this age. What’s puzzling me is the hole in its centre. It is about 10in wide – a dark scoop, as if someone has taken a giant ladle to the roof.

When I climb the ladder for a closer look, I can see toothmarks on the reed. I also see that the hole does not go all the way through – the animal obviously gave up after an exploratory burrow.