Reference article
Gray Tufted Duck
Gray Tufted Duck is a local rival who offers a race in Swamp.
Challenge
Speak to this duck in 
Swamp to enter 
Gray Tufted Duck’s Race. There is no specific level requirement to enter.
Dialogue
Have you learnt how to swim yet? Enter my swimming race! If you haven't done swimming training yet, I don't think this race will be for you. Just saying.
Race guide
See Gray Tufted Duck’s Race for the course and rewards.