The system might ask how the fish would use its wings. After considering several possibilities, the students decide the fish should use its wings to help it fly. The addition of the act of flying raises yet more questions, and the student now must deal with what else his fish needs in order to fly, as well as how flying could help the fish to survive. This might be a good time to talk about flying fish, or dolphins, or why birds fly. Giving the students control over their own learning allows them to take advantage of Creanimate's capacity to show video clips of actual animals.
Students see what they want to see and are, therefore, immediately interested.