Why do ducks stand on one leg in hot weather?

This has nothing to do with hot weather.

Ducks don't sleep on one foot for everything, which should be emphasized by primitive wild ducks (including chickens, swans, wild cranes and other poultry). In nature, there are many birds sleeping on one foot, and they all have many natural enemies. If they are threatened when sleeping, if they sleep on their stomach, they must stand up before flying, which can easily become a good meal for natural enemies. Sleep standing up, take it off quickly and conveniently, and get out of danger easily. The flight ability of poultry is basically degraded because it is divorced from nature, but this nature of escape has always remained in genetic information. Why do you have a foot? If you have two feet, both feet will be tired at the same time, but with one foot, one foot can rest and change beauty every once in a while.