interspecies consideration.
"Consider the deer and the junco.

If a deer wanders into this bird’s nesting territory, the junco will rise up and stand tall, turn toward the deer, and issue its mildest, meekest alarm call.

Who could hear this barely audible ttth! ttth! ttth!?

But the deer does hear. It pivots its ears forward and pauses: Oh, okay, I get it. Then it takes a step back and circles around.

bird language students have recorded the phenomenon in their journals innumerable times."