What do birds use to walk and perch on trees?
hindlimbs
The correct option is C.
Explanation of correct option:
Explanation of incorrect options
Option A:
Birds use wings to fly and travel from one place to another in the aerial medium. Walking is not supported b the wings.
Option B:
The forelimbs are modified as wings in birds. The forelimbs do not support walking.
Option D:
Birds do not possess fins. Fins are the forelimbs in fishes that help to balance and stability.
Final answer: Birds walk and perch on trees using hindlimbs.