
Two-Tone Whinny: Horses Whistle While They Speak
A new study shows the horse’s neigh is a two-tone sound: a low-pitched voice-box vibration paired with a high-pitched whistle that escapes through a tiny opening. Researchers filmed inside horses’ noses and analyzed dead horses’ laryngeal tissues to confirm the dual mechanism, making horses the first known large mammals to whistle while they vocalize. The two frequencies may help convey multiple emotions or messages during social interactions.













