I often forget about the bats in the Game Gear version of Ecco 2. You can find them in the underwater caverns if you jump high enough. If you sing to the bats they will heal your wounds, they are mentioned on the back of the games packaging.

Bats like Dolphins use echolocation for navigation and to communicate with one another. Bats are nocturnal and live in dark caves, echolocation is essential for their survival.

The term blind as a bat doesn't fully apply to Dolphins due to their high intelligence and enhanced vision. Dolphins can see above water equally well as underwater. Bats eyes are optimized for darkness which is why they come out at night. During the day bats must rely on echolocation to navigate,

In conclusion the next time you see a bat in the wild make sure to remember they can't see very well and they will heal your wounds in the Game Gear version of Ecco 2.