We understand what another person is saying over the phone, but at the personal meeting we get more than mere speech. There may be something like birds.
When we talk on the phone, we do not see his face, his eyes, even though they can reveal many emotions. We only have to think on the basis of the sound, but it can also give some uncertainty. This would be the case with birds, if they only heard their voices, so that they would not swing.
Fortunately, however, this is not the case because many birds are singing while in motion. Jumping and dancing are not just about getting the tension out or because they can't stay in place because they also illustrate the content of vocals with movement.
Experiments have already proved that if birds are singing and dancing, there is a much greater chance that the opposite-sex birds will notice and respond to their voice. Moving with the movement serves to raise the awareness of another person more efficiently, as well as motivation.
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Pixabay.com (Images are illustrations)