Dolphins call each other by name using distinctive whistles that other dolphins recognise.

The longer version

Each bottlenose dolphin develops its own signature whistle early in life, a melodic contour that stays broadly stable for years. The animal broadcasts it when joining or leaving a group, effectively announcing who it is across water where visibility is poor.

Other dolphins respond by copying that same contour back, which functions like calling a name in a crowded room. Mothers and calves whistle back and forth during separations, and allied males match each other's calls when coordinating. The system works because sound travels roughly four times faster in water than in air and carries much farther, making acoustic identity more useful than sight in murky coastal habitat.

Where this entry sits

This collection gathers small surprises about mammals, reptiles, amphibians, birds, fish, insects, and the pets living alongside people. Expect odd details about senses, anatomy, and everyday behaviour that many people never notice in the animals around them. The full list sits on the Animals page, where every entry is listed in order.