I have just seen a squirrel jump off my bird feeder onto the ground.
It hopped along the scrub area. A partridge was ‘walking’ towards it.
They were very close to each other, but didn’t take any notice of each other. I suppose they live in the same scrub and so come across each other often.
I don’t know.

Pheasant in Yorkshire

grey squirrel in yorkshire
If they aren’t in contest for food and are totally different maybe they just take each other for granted