Step 1: Natural behaviour.
Crows use their beaks to poke and peck at objects like flowerpots.
Step 2: Option analysis.
(A) noses: Incorrect, birds don't have noses like humans.
(B) beaks: Correct.
(C) legs: Incorrect.
(D) hands: Incorrect.
Step 3: Conclusion.
Correct answer is (B) beaks.