Some of them just like to climb too, despite what some people may claim. I have been told repeatedly that BPs "don't climb." They climb just fine, they're just generally not very good/graceful about getting down again, preferring to go for the awkward flop 'n plop instead.

In some ways that's the fun part of owning a BP, they may not be great display animals, but they will keep you guessing forever why they do the things they do. Of course it's also the part that can drive you crazy .