The river running around the deepest part of the hollow asteroid is home to a colony of Florida manatees. In intelligence tests, manatees have performed at least as well as dolphins, in both pattern recognition, and task performance, just more slowly. Unlike most other intelligent aquatic mammals, the manatee's flippers are visible in their field of vision, allowing for fine grained flipper-eye coordination. There is no reason why a manatee would not be able to operate a touchscreen device, in theory.
