Reference article
Green Tufted Duck
Green Tufted Duck is a local rival who offers a race in Mountains.
Challenge
Speak to this duck in 
Mountains to enter 
Green Tufted Duck’s Race. There is no specific level requirement to enter.
Dialogue
Are you brave enough to enter my race over the gorge?! If you can't fly very well your chances of making it to the finsh are quite slim. Try not to fall in!
Race guide
See Green Tufted Duck’s Race for the course and rewards.