We got our two male rabbits castrated yesterday. They seem to be doing fine and recovering well, although the smaller of the two has seemed a little bit subdued. However, we've noticed a sudden change in the behaviour of the larger one - he's suddenly started humping the smaller one - repeatedly and without seeming to tire until we separate them. Is this common? Will it calm down? Most importantly, should be keeping them separated, or will this cause more problems when we try and put them back together? They've always been fine together, this has literally just started since the operation yesterday. I'm worried the little one is going to be stressed/traumatised/physically hurt by the other one - but I'm also worried that by keeping them separate we're making it worse. HELP!