I'm new on here but i have raised chickens before and a couple turkey but i just got some baby red island red hens, some striped hens and two ducklings. Sadly i don't know if one is a black swedish or a Cayuga duckling and i really don't know what the yellow one is but they are all just so cute.
and Welcome To BYC! congratulations on the new babies! You might try posting on the Ducks forum for help with id'ing your ducklings