Antarctic Seals Vocalize in Ultrasonic

The seals sometimes vocalized at ultrasonic frequencies of more than 200 kilohertz.via Scientific AmericanAbove the frozen ocean, Antarctica can be eerily quiet. Gusts of wind are often all one hears. Below, though, the Southern Ocean is a living soundscape dominated by Weddell seals. These pinnipeds typically emit high-pitched pings that...