Dolphins

Richard Connor of the University of Massachusetts Dartmouth tracked 120 males in the Shark Bay, Western Australia and found no evidence that dolphins form the groups to control either territory or sexual partners, suggesting their society is unusually open.

The researchers found no evidence that the large and complex social network in Shark Bay, comprising hundreds of bottlenose dolphins, is a closed group defended by males.

They also found no evidence that males defend smaller ranges or groups of females within this network.

“This discovery gives us great hope that there is a future for Irrawaddy dolphins,” said WCS researcher Brian D. Smith, who led the study. “Bangladesh clearly serves as an important sanctuary for Irrawaddy dolphins, and conservation in this region should be a top priority.”

The scientists counted nearly 6,000 of the dolphins in the South Asian country’s Sundarbans mangrove forest and the adjacent waters of the Bay of Bengal.