Loud enough to deafen you if you stand too close.

Researchers have found that roosters produces 1 to 2 second crows that can get as loud as 143 decibels. This is equivalent to standing 15 meters away from a jet taking off.

But if that's the case, how do roosters and surrounding chickens tolerate this noise?

Researchers have found that when a rooster’s beak is fully open, as it is when crowing, a quarter of the ear canal completely closes and soft tissue covers 50% of the eardrum. This means roosters aren’t capable of hearing their own crows at full strength. The intensity of a rooster’s crow diminishes greatly with distance, so it probably doesn’t cause significant hearing loss in nearby hens. Interestingly, unlike mammals, birds ca ...