>>> I know that this is normal behaviour
Yup! Totally normal! Well, it is in my house anyway ;-)
For example, a couple of mornings ago, I heard Moonbeam crying outside. So I put some extra special (i.e. extra expensive) cat food on a paper plate for him and went outside to give it to him. Then I noticed his big brother, Chequers, watching him and I knew that, as soon as my back was turned, Chequers would shove Moonbeam out of the way to get at the food. So I had to stand guard over Moonbeam until he'd finished eating.
So, of course, it was perfectly normal that I was stood on the front path of my house, in nothing but my underpants and clutching a torch, at 4.15 in the morning. Er, wasn't it then?
;-)