Uplifting images of dolphins

As seen in Golfo Nuevo, Argentina, dusky dolphins (Lagenorhynchus obscurus) communicate with each other to herd anchovies into balls so they are easier to catch.

These bottlenose dolphins (Tursiops truncatus) in Honduras, are semi-captive, moving between a large enclosure and the open sea as part of a research project on their behaviour.

These spotted dolphins (Stenella frontalis) off Bimini in the Bahamas are part of a study in how they communicate with each other.

Spinner dolphins (Stenella longirostris), seen off Oahu, Hawaii, are known for leaping out of the water and spinning. They may do this to dislodge remoras and to communicate.

For 30 years, scientists have been trying to better understand how these spotted dolphins (Stenella frontalis) around the Bahamas communicate. They have even tried using computers to interpret the animals' whistles, with some success.

Bottlenose dolphins feed in the waters off Bimini.

Scientists have been studying incidents of interspecies mating attempts between spotted and bottlenose dolphins in the Bahamas.

Spinner dolphins forage at night in the deep water offshore then come into shallow bays in the morning to socialise and rest.

University of Mississippi scientist Stan Kuczaj is studying how 30 semi-captive dolphins learn and cooperate in Honduras.

Spinner dolphins off Hawaii display strong social bonds.