I'm getting aware that many of my recent posts have been angry or downbeat. So here's a lovely one.
A dolphin in New Zealand actually came to the rescue of two pygmy sperm whales, which repeatedly beached themselves. After they and their human rescuers had given up on getting them successfully past a sandbar, Moko came along, communicated with the distressed whales, who then changed their mood and followed her out to sea.
It doesn't get much nicer than that.
The Kiwis report it here, and if you think this behaviour is unlikely or uncommon, think again.