Some years back, I was at a fast food joint and there was a considerable amount of food trash scattered in the parking lot.
This attracted the attention of some seagulls and crows. They were busily picking at the trash, but what was interesting was that they had segregated into two groups, one black and one white, with little intermingling.
Birds are racist, just like people.
I’ll bet it was the crows...they act as clans. Gulls act more individually and don’t care what other birds are around.