Less heartwarming is the fact that you really shouldn’t waste your time on creatures with fewer than two stars. Potential notwithstanding, they just aren’t worth the effort, Magical Books, and other resources.
It’s not their fault. They’re cursed from birth with an inability to evolve, and it’s only through evolution that creatures reach their full potential. Unfortunately for 1-star creatures, their greatest potential is as food for other, better creatures.