Oceans

In a paper published in the journal Ocean Sustainability, researchers call for stricter rules on fishing, saying many products marketed as sustainable are not.

Scientists studying sperm whales in the Caribbean say their calls are so complex, they are comparable to the human language.

It is thought that baleen whales use songs – in the form of moans, grunts, thumps and knocks – to speak to each other, orient themselves and find mates.