Hi, I have 2 male-female bonded pairs that I'm trying to introduce together. Similar ages and sizes. I've bonded rabbits together before and had no issues but this one is proving difficult. One of the males (Henry) keeps nipping and starting a fight with the female from the other pair (Bella). The other female is getting along fine with everyone but Henry is being aggressive which he has never demonstrated before even when going through the bonding process with his bonded partner Robyn. The two boys have done a bit of chasing but they're ok and I think will settle. I've no idea why Henry keeps going for Bella she's a very sweet and friendly rabbit and seems keen to make friends. Has anyone got any suggestions? I've done all the usual kept them side by side, introducing them in neutral territory etc He is ok with her but only for as long as I'm stroking his head. The second I stop he goes for her. Is this bonding doomed to fail? I've had them 2 months. Any suggestions would be really appreciated, thank you