A true story:
In March of 2008, some pygmy sperm whales were saved by a dolphin. It happened in New Zealand, Mahia Beach (on the North Island). Two whales were beached there, and no one could guide them back to open water.
The exhausted whales would have died if Moko the dolphin had not arrived. Moko was already a real star. Everyone knew him. He would play with beach-going children and adults alike. Anyway, along came Moko, he made a few circles in the water and then set off, and the whales followed him. Then, at a sudden bend, Moko turned into a narrow stream, and the whales followed him. After a couple of hundred yards, the whales reached the open sea, and since then, they’ve never returned. A couple of hours later, Moko was back, swimming along the shore.
Whale and dolphin. Two completely different animals. How could they communicate?
"Via a secret channel?"