Giant otters hum, scream, say ‘hah’ and more
Underappreciated vocalists make 22 different calls as adults
![otter](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/11/sm_4012903963_db11d4ba3d_o_free.jpg?fit=860%2C460&ssl=1)
OTTER SPEAK Giant otters make a rich variety of sounds as they negotiate their social lives, says a new study analyzing their vocal repertoire.
Joachim S. Müller/Flickr (CC BY-NC-SA 2.0)