Bird power consists of three separate aspects:
- card level
- hat level
- slingshot level
- hatchling level
Card level can be raised by collecting feathers of the right color, each bird card shows how many feathers you need to collect to level up the card. Hat level is shown in the hat menu; the more expensive the hat, the higher level it is. Slingshot can be leveled up by collecting full hat sets; the more full sets you have, the better your slingshot will be. You can also level up your hatchling by feeding them.
The combined power of these three aspects is shown in the top left corner of the card and by tapping that card you can see how the power is distributed.
In the hat menu, there is a small icon with an “i” on the left, that shows all you need to know!