A duck costume would be a unique and creative choice. To make it even more unique stay away from character ducks, such as Daisy Duck or Daffy Duck. A home made duck costume would be the best way to assure that your costume is as unique as you.
If you are looking information on how to make your own duck costume for a toddler, the best site for your question on holidays.thefuntimesguide.com/.../homemade_halloween_costume
You can make the tail move in your monkey costume by swaying your body. You can also use fishing line to rig it so that no one will see.
be creative
get a purple shirt, white tutu and a big pink hairbow.
you need a professional costume designer to make a tail that looks real, but not actually is.
You can find a devil tail costume for Halloween at costume stores, online retailers, or party supply stores.
waddling its tail waddling its tail
super tail
Family Fun Magazine offers some great Halloween costume ideas. They offer individual costume ideas or ideas you can use for the whole family! http://familyfun.go.com/crafts/ducks-662521/
does it have a curl on the top of the tail feathers? if so it is a male.
Besides rubber duckies, some other popular duck characters often featured in costumes are Daffy Duck, Donald Duck, Scrooge McDuck, and Daisy Duck. Another popular duck costume character (especially for Oregon residents and fans) is that of the Oregon Duck's mascot. The Oregon Duck's mascot wears a green and yellow costume, with a green and yellow beanie cap.