The cattle egret, belonging to the heron family, likes to feed around large animals such as a carabao (water buffalo) or cow. It is three times more effective when foraging with cattle than when foraging alone.
The buffalo doesn’t seem to mind them, and oftentimes the herons are perched on it.
It is believed that the larger animal benefits as well by being given a “cleaning service” from ticks and other parasitic animals.
I scratch your back, and you scratch mine. Nature can teach us a thing or two about symbiotic relationships.