Wild parrots spend some time each day preening each other, and this behavior is necessary emotionally for them.

野生鹦鹉每天会花一些时间相互打扮的，这种行为对它们是必要情怀。

youdao

Unlike apes which spend much of their time picking dirt and lice off their skin and fur, elephant preening is more about rolling in mud than removing it.

ECONOMIST: Self-recognition