Krasivanova Twig

They produce clicks that they use to find their way around, picking up echoes from objects in their environment, including the prey they're hunting.

And Dr Fortune said the sound recordings suggested that the two species might be listening to each other.

The researchers also saw evidence of the animals sharing food.

Killer whales brought salmon they caught to the surface and broke it apart.

And since they're not the cleanest of eaters, Dr Fortune says this meant there were plenty of leftovers for the dolphins.

The researchers think this association could be about more than food though.

The more diminutive dolphins might benefit from sticking close to a group of much larger, more powerful killer whales, a kind of interspecies protection from other predators.

Whatever the motivation, this was a remarkable insight into cooperation between two powerful marine predators, apparently working together in the wild.

The BBC science correspondent Victoria Gill reporting.

We're eight weeks away from the Winter Olympics starting in Milan in Italy.

And if you're watching Team USA, you might see a slightly unexpected face coaching the athletes from the sidelines.

With more, here's the newsroom's Woolchalk.

If you're looking for an Olympic coach, you might pick an expert in the sport, someone who's got experience competing at an elite level, or a renowned psychologist.

I mean, you could look for all of those things, or you could just get a world-famous rapper.

Team USA have gone for the latter option and named Snoop Dogg as an honorary coach for the Games.

I should say, for clarity, they do also have other coaches too.

But the US Olympic Committee says Coach Snoop will join the team behind the team to offer his unique expertise.

If you're thinking one of the most iconic rappers of all time is an odd fit for an elite sport set-up, you would normally be right.

But in Snoop Dogg's defence, this isn't his first rodeo.

Now, MP...