Triangular ringer. Bell ringers are distinguished by an unusual voice...

Bell ringers are distinguished by an unusual voice, similar to the distant ringing of a bell. Or the creak of an unoiled swing. Sounds can be heard at a distance of a kilometer. Ringers are one of the loudest birds on the planet! Birds do not reproduce their song instinctively, but learn it. Over time, the song improves and changes. And the whole concert, as usual, is for females only!