I think it's just a thing about binliners: my two go mental for hay in a binliner (I put the stuff I can't fit in the hay bale storage area, which is slightly too short for a hay bale, in a bin bag)... Maybe they're attracted by weird-textured black sheety things?! Anyway, as soon as I try and take it away because they're apparently finished (and are off schnoofling around the rest of their areas) they're straight back in it and I nearly have bunnies-in-a-bag!
I suppose it's a good way to get them to the vets...? :lol: (just kidding!)
I do like how Endeavour is watching you, making sure YOU know YOU'RE wrong for stopping his destructive playtime! ;P