Why does the scarecrow volunteer to be the first for the lion to carry across the ditch?

The scarecrow volunteers to be the first for the lion to carry across the ditch because he wants to demonstrate bravery and support his friends. By stepping forward, he hopes to encourage the others and show that even those who may seem lacking in courage can take initiative. His selflessness reflects his character and desire to help, highlighting the theme of friendship and teamwork in their journey.