Reference article
Yellow Spiky Duck’s Race
Yellow Spiky Duck offers this race in Mountains.
Entering
Click the local rival and select a duck. There is no level requirement to enter.
Course
Running, swimming and flying. Ordinary races play automatically; trained skills and sufficient energy determine whether the duck reaches the finish.
Winning
Winning gives you 150 coins the first time you finish first. Once defeated, this rival no longer offers the race.
Progression
Winning supplies the invitation for 
Mountains Tournament.
Rival
This race is offered by 
Yellow Spiky Duck.
Original Flash note
Some races give different coin rewards in the original Flash game.