Reference article
Seed (Duck Life 2)
A cheap food that raises energy by 0.6 levels.
Buying and feeding
Spend 1 
Coins at the normal-seed dispenser and let the duck eat the seed. Food raises 
Energy; it does not train racing skills. A new game starts with 5 coins and no stored seeds.
Compared with Super Seeds
Five normal seeds cost 5 coins and give the same 3 energy levels as one 15-coin 
Super Seed. Normal seeds give three times as much energy per coin.
Versions
Original Flash and later editions use the same energy effect.
Across the games
Compare games and editions on the 
Seed page.