One size, can be made in any colour but this pattern has instructions for yellow, white and mallard variants along with pictures and a free video tutorial on my youtube

30g white/yellow chenille yarn
Thread orange chenille yarn
(Optional: 10g/20g/10g green/brown/white chenille yarn
5mm hook
12mm safety eyes x 2
Polyfil stuffing

This pattern is worked in shift stitches, place a st marker at the beginning of row 3, this will be the back. Your tension may be different to mine, so be sure your wings and tail are positioned correctly by adding stitches at the end of a round if it ends off-centre.

3 variations included