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American bittern inflates esophagus to produce its unique call
The American Bittern produces its unique call by inflating its esophagus, a muscular tube connecting the throat to the stomach that helps amplify the sound.
As it bobs its head, it uses its syrinx, a specialized vocal organ located at the base of the windpipe, to generate the call.
This call serves as a territorial and mating signal during the breeding season across wetlands. If you listen closely, you can hear another individual responding at the end of the clip.
