Dolphins and many other mammals smile while playing

Human eye Viewed, the rigid face of the bottle dolphin seems to be in a durable smile.

However, the actual expression to be interpreted as a smile is the opening of the mouth for a playmate, the researchers say In Iscience magazine. Games with chases can be rays, so it is important to communicate to your friends that it is not about aggressiveness.

Italian And French scientists followed the play by video for over 20 dolphin behaviors in two dolphinaries outside the screen times.

During that time, the players together saw nearly 1,300 trends and only one of those who play alone. When the dolphin smiled, about every third time, his playmate immediately smiled back.

According to the researchers, that is responsible for what has already been observed in many dry land mammals: the interrupted bite movement has evolved into a ritual gesture of goodwill.

For example, wolves, spots and murmuries, or quad -fingers, “smile” to their friends by relaxing their mouths. Makas and Paavanes take the play, and people and people are laughing.

There is also a typical smile, which is likely to be reflexive and tells about the emotional state of the emotional state. For example, a person has been measured to react with the look of another person so quickly that it cannot be conscious.

Dolphins seem to copy the benevolent look of their friend as often as previous measurements, for example, four -finger and little bears.

Published Science in Nature 1/2025