Some background info: my indoor rabbit is a castrated male who free roams when I’m home. He is overall a happy bun since I take good care of him and take him yearly to the vet to get his shots and to get a health checkup. He shows his happiness with many binkies and flops.
However when he was small (before the age of 1) he broke his leg due to a bad jump. This injury healed after time and treatment. He can jump and run fine (though he can’t move his toes on that foot anymore). However I do notice he often stretches out his once broken leg when he sits.
Since he turned 2 he has however, gotten quite jumpy and somewhat aggressive towards to me whenever I move things around in his cage. For example when adding hay, taking out his food bowl etc. He makes a loud honking sound whenever I do these actions and sometimes charges at my hand. He has also bitten me when charging (it’s not a hard bite, just a warning). I don't believe he is aggressive but simply fearful of either the motion of my hand or the sound.
My question: could this behaviour be caused by trauma from his past injury? Or is this territorial behaviour, even if he's neutered? Or is there a different reason I have yet to consider?
I would love to hear if anyone has similar experiences.