system
Given the following post, respond as if you're commenting on Reddit:
human
How do migratory birds know which direction they’re going?

HOW?!?!
gpt
Some animals sense magnetic fields.  Others follow the stars.  Of course, it is pretty easy to tell what direction you are headed just by noting where the sun is.  In the morning your shadow points west.  In the evening your shadow points east.  At noon your shadow points north (in the northern hemisphere)