Based on the penguin feet pattern in the book, Knitted Wild Animals by Sarah Keen. I decided to rework the pattern a little bit in a way that would help me to understand it :)
Feet are worked in garter st.
Cast on 9 sts.
Row 1: K
Row 2: K4 turn
Row 3: S1k, k to end
Row 4: Bind off 3 at the beg of next row, k to end (6 sts)
Row 5: K6, Cast on 3 sts (9 sts)
Row 6: K
Next: Repeat Rows 1 – 6 once
Next: Repeat Rows 1 – 4: Instead of binding off 3, bind off all sts