Your Dexterity score increases by 3, your Wisdom score increases by 3, your Strength score is reduced by 2, and your Intelligence score is reduced by 8.

Tragically, your typical duck species is going to have a short lifespan between 5-10 years. A common age of maturity in some duck species is a year.

You're a duck. Beasts don't have an alignment typically but if you're playing as this then you may fill the role as an exceptionally heroic or villainous waterfowl. Let's face it, though - your intent here is to probably play as chaotic neutral as possible.

You can understand a very limited set of words and phrases in a language of your choice, but as a duck you don't have the mental capacity or vocal ability to speak. Any other learned language is equivalent to learning simple commands or phrases in said language. You can communicate with other waterfowl in a manner similar to the effects of the speak with animals spell, however.

Your size may vary depending what species of waterfowl you choose, with the average duck weighing between 2 and 3 pounds and having a wingspan of 3 feet. Your size is Tiny.

Your base walking speed is 15 feet, your base swimming speed is 20,  and you have a base flying speed of 50.

You are considered a beast rather than a humanoid.

Your hard, billed beak is your natural weapon which you can use for your unarmed strikes. If you hit with it,  you deal bludgeoning damage equal to 1d4 + your Strength modifier. Your attacks using your bill have advantage against any creature smaller than you that is submerged in water and bread.

Your extra layer of soft protective feathers keeps you warm and safe. Your unarmored armor class increases by 1 and you resist cold damage.

Your maximum hit points are reduced by 2 and then another 1 point for each of your character levels.

The duration you can hold your breath is doubled.

You have advantage on Wisdom (perception) checks that rely on sight.

As a non-humanoid beast, some basic features assumed by most races will not apply to you. This includes the lack of hands or any other limb that allows for a grip and limits what you can wield. Instead, you can only hold a single weapon or a shield in your mouth or beak at a time. You also cannot equip weapons that have the Heavy or Two-Handed traits and attacks using weapons without the Light trait are made with disadvantage. Picking up objects requires a free grip and cannot be done if you have a weapon or shield equipped.