Dolphin Moms Employ 'Baby Talk' to Bond With and Teach Calves

According to research, bottlenose dolphin mothers raise the pitch of their signature whistles when communicating with their calves, similar to the way human mothers speak to their babies.
Higher pitch and wider pitch range are used by dolphin mothers only when directing their signature whistles at their calves.
Dolphin baby talk may help calves learn to produce different sounds and draw attention to the mother when she is addressing them.
Dolphin baby talk provides an example of convergent evolution between dolphins and humans and strengthens the mother-calf bond.
While the study focused on signature whistles, it's unknown whether dolphin baby talk also occurs during other types of communication between mothers and calves.