1. Hand-signal training: In this video, you will learn how trainers use a hand-signal to signal dolphins to do a trick.
2. Bubble Rings: In this video, researchers did an experiment with bubble rings. Dolphins can blow bubbles, but rings were something new for them. The dolphins made a game with the bubble rings; each one had his or her own version of the game.
3. Pregnancy test: Female dolphins detected that one of their trainers was pregnant; they started circling around her! (This video talks about this experience, but does not show it).
