In Dolphin's Rescue, the young dolphin we met in Dolphin's Triumph di scovers her friend in danger. She must find a way to help, and quickly. Then she remembers what her mother taught her.

The bottlenose dol phin communicates using high-pitched whistles, squeaks, creaks and click s. It uses those sounds to make sense of the underwater world using echo location: sending sounds that bounce off an object back to the dolphin, which then interprets the sound.

About the Author: Rebecca Johnson is an award-winning primary school science teache r and has written more than 60 books for children.