Brazilian fishermen follow instructions from wild dolphins to know where to throw their nets, video shows

• A video shows a rare example of wild dolphins collaborating with humans to fish in a small lagoon in Brazil.
• The dolphins learned how to tell the humans exactly when to throw their nets to catch the most fish.
• The dolphins also benefit from the exchange. They catch more fish and stay safer than fishing alone.  

Along the coast of Laguna in southern Brazil, you can hear the buzz of bottlenose dolphins hunting for their prey.

Here, the wild dolphins work hard to herd fish around the lagoons, signaling to local fishermen when it's time for them to throw their nets.

The unusual example of cross-species partnership has been going on for more than a century — and now scientists have finally worked out why.