Question

Why does the poet says about the posture of the squirrel in line 3 of the poem

Answer 1

The squirrel 'sat up straight' to eat a nut . Else, the squirrel usually sits and runs with a bended back.

I hope this is helpful for you

Answer 2

Answer: The poet says that the squirrel sat up straight and had a tail shaped like a question mark when he eats a nut.