Skill
Energy (Duck Life: Space)
Energy capacity keeps a duck racing longer; feeding increases its energy experience.
Food and capacity
Buy 
Seed from a town feeder. A completed feeding awards 400 energy XP to the duck that eats it. XP is converted using the game’s curved level thresholds, so this is not a fixed number of levels.
Race use
Your duck starts a race with a full energy reserve. Movement uses energy, and boosting spends extra. Feeding raises its energy capacity.
Limits
The maximum energy level is 100.
Across the games
Compare games and editions on the 
Energy page.