JJ asked:

Why do birds run [rather than fly?] when you go near them?

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Birds land usually to eat some food stuffs left by people, when you walk near them, they think you just
want to pass by, so they run away, just to be sure you won't hurt them, and then come back to place
to continue their meal, so they don't miss the food location. Also they don't make an effort flying for
such a quick event.

This is a good question, maybe someone may think it's not philosophical, but "simple" notes like this
always inspired people to think about and invent really great things. And I think Aristotle or Socrates
once wondered how a gecko sticks to a wall!

Arthur Brown