It's a rich, yellow mayonnaise. Duck Mayonnaise is an Artisan item that can be sold or used in a variety of ways. Duck Mayonnaise can be made in the Mayonnaise Machine by adding 1x Duck Egg.

Duck Feathers are an animal product gathered from Ducks. Ducks are unlocked when you upgrade a Coop to a Big Coop. You can then purchase them from Marnie at the Ranch. With sufficient happiness ...