Reference article
Seed (Duck Life: Space)
Town seed is food that increases the eating duck’s energy experience.
Buying and eating
Click or tap the feeder with enough 
Coins. One food object is served at a time. A waiting duck eats it; the completed eating event grants that duck 400 energy XP.
What it improves
Seed increases 
Energy, rather than running, swimming, flying, climbing, jumping or intelligence. The amount is XP rather than a fixed level increase.
Across the games
Compare games and editions on the 
Seed page.