Caves were essential for these Ice Age bears to hibernate during the winter months.

BBC: Early human 'squatters' drove cave bears to extinction

Rolland can trap anything - wolves are the biggest challenge, and he took 23 of those alive last winter - but today he is looking for bears. he drives out to a popular spot where bears congregate. he has brought a bait box with him, from which he pulls out, rather unexpectedly, a slab of cake.

BBC: Qu��bec's wood runners

Two of the trips are in June, when bears are busy stuffing themselves after their winter hibernation.

BBC: Ten weekends in Europe's great outdoors