Researchers have found evidence of the same brain pathologies in dolphins that are present in the brains of humans who died with Alzheimer's. What might this suggest about Alzheimer's in humans?
Complex behaviour such as regional accents and cultural food preferences in whales and dolphins seems to be linked to brain size.
More than 400 whales have died on a beach in New Zealand.
As the vaquita porpoise heads towards extinction, new management measures in Mexico still may have missed the point -- affecting not one but two critically endangered marine species.
Globally, a quarter of whale and dolphin species are endangered. Though South African dolphin populations are generally in good heath, the humpback dolphin is cause for concern.