Dolphins name themselves with a whistle
The marine mammals respond only to their own handles
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/07/mr_13-04459-large_feat.jpg?fit=860%2C460&ssl=1)
ANIMAL HANDLES Wild bottlenose dolphins (one shown) respond to hearing their "signature whistles," specific high-pitched tunes that may serve as the animals' names.
Courtesy of V. Janik, University of St. Andrews