Flappy Birds and Adorable Rodents on the evolutionary scale

I have signed up to be part of the TTLB Ecosystem several month ago, and I have found my way up to be a Flappy Bird.

Then a few days ago I moved up the evolutionary scale, and for one glorious day I became an Adorable Rodent. Again I became a Flappy Bird, but I would rather be an adorable rodent, -maybe because they are more soft than birds. I wonder how the Ecosystem finds out whether I'm a Flappy Bird or something else?