This is my theory. Every morning, I give breakfast to these cute hamsters. At first, I put Pudding and Angel out of the cage so Robo and Robi could eat freely. They are scared of Pudding, you know. Pudding is a devil at night. Anyway, in that way, Robo and Robi could not get all the nutrients in their food. So, I gave food to them, all of them in the cage. Then, Robo and Robi couldn't eat because of Pudding and Pudding and Angel all ate very much food so there were no food left for Robo and Robi.
So my conclusion is that I must give Robo and Robi food containing enough nutrients.
