Bird levels in AB2
Hello everyone, I tried to find explanation on Forum and Nest's posts but I couldn't find it, I need explanation on how birds level up in game. I noticed in Arena that there different star levels, feather levels and also different frames.
What does frame colour mean? How many different frames we can get? What are requirements for leveling up from one level to next level, what are total reqirements for leveling up from level one to max?
Does anyone make calculation on how many feathers are required to progress and level up bird from start to maximum?