In my Kepler Bb story, some of the humanoids that go to school, in fact a lot of them, have some kind of morphing power. Here is an example of what a typical grade in Wilderness Survival class(which is weighted especially on females since when they are looking for a husband they either stay with their relatives until they find one, or they survive in the wilderness) would be like: Day 1: Mentor: Okay, before we go out into the wilderness lets see if any of you have morphing powers. (Students morphing) Student 1: I have shark power. Student 2: I have venomous snake power. Student 3: I have gecko power. Student 4: I have otter power. Student 5: I have bird power. Student 6: I have turtle power. Student 7: I have crocodile power. etc. Mentor: Okay, those will all have their place. As for the ones without morphing powers you have a slight disadvantage. However if you have other powers like IR vision, heat resistance, and cold resistance you are still likely to survive. 1 year later Mentor: You have done such a great job that I am leaving you here until next year. Next year I will pick you up and grade you. Anybody who gets a grade lower than B- has to either leave the class or learn more until they get at least a B- 1 year later The students have kept track of what they did at what times. Mentor: Time to pick you up and grade you. (Mentor grading) Mentor: Crocodile man, you have done a great job, A+. Gecko girl B-, etc. Now I know these names may sound like comic book names, but really they are just nicknames for the students. Now I know that morphing requires a lot of energy. The ones that would require the most energy I think would be shark and crocodile. So what would a humanoid do before morphing? Fill its stomach to maximum capacity and wait for the big meal to be digested?