Marine biologists and philosophers have joined forces to support a controversial declaration of rights for whales and dolphins on the grounds that their astonishing intelligence and emotional empathy puts them on a par with humans.
They say research into the complex behaviour of cetaceans - whales, dolphins and porpoises - reveals that these sea mammals are so highly evolved and complex in terms of their behaviour that they deserve special protection with a universal bill of rights.
Dolphins and whales have complex vocal communications and are able to learn an astonishing variety of behaviours when they come into contact with humans, such as co-operative fishing with native fishermen.
The proponents of the bill of rights argue the cetacean mind is so advanced and self-aware that whales and dolphins should be classified as "non-human persons" who deserve the right to life, liberty and wellbeing.
"A person needs to be an individual," said Dr Tom White, a philosopher at the Hilton Centre for Business in Los Angeles. "If individuals count then the deliberate killing of individuals of this sort is ethically the equivalent of deliberately killing a human being.