The phrase "friendly dolphins" refers to dolphins that are kind and gentle towards humans, often appearing friendly and playful when interacting with people. Full definition
Visitors swimming in the water are delighted to possibly share the ocean with friendly dolphins and other marine animals. (10best.com)
For my part, I kept my eyes peeled for friendly dolphins (who unfortunately remained hidden), but I spotted turtles so large and old in their graceful swim past the boat. (womenshealthandfitness.com.au)
You may even be lucky enough to encounter friendly dolphins that come close to the shore, as many visitors have happily reported. (allbestbeaches.com)