One is larger with a bonnet and a shawl, making it the Mother Duck, and there are 3 smaller baby ducks.

Mother Duck notions:
Yellow DK weight yarn - 4 oz
Orange DK weight yarn - “a small ball”
Red DK weight yarn - 1 oz (optional, for the shawl)
Blue DK weight yarn - 1 oz (optional, for the bonnet)
Black wool/thread for eyes
Stuffing
Cardboard (optional)

Baby Duck notions (per duck)
Yellow DK weight yarn - 1 oz
Orange DK weight yarn - “a small ball”
Black wool/thread for eyes
Stuffing
Cardboard (optional)

You will need slightly more yellow yarn if you do not use a cardboard base for the ducks.