We do know that dolphins have the ability to visualize, through use of their "sonar" and large brains, images of objects in the water. Dolphins are known to either sense or "see" when human women are pregnant, and display protective behaviors around them.
I'm thinking about these things as I watch a YouTube video sent to me by my sister, Laurie Praskin. This TV clip describes a dolphin in Aotearoa (New Zealand) saving two stranded whales. If you watch this you can see that it's not a stretch of the imagination to deduce that there are acts of compassion and cooperation in the cetacean world - between species. You'll also see the dolphin playing with children at the beach. Here's the clip. Thanks, Laurie!