Alternative solution:

                                
1. Take two chicks.              =>
2. Bring one chick back.         <-
3. Take two chicks.              =>
4. Bring one chick back.         <-
5. Take one wolf, one chick.     =>
6. Bring one chick back.         <-
7. Take one wolf, one chick.     =>
8. Bring one chick back.         <-
9. Take one wolf, one chick.     =>