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Monarchs can warm up by basking in the sun. Basking helps a monarch raise its muscle temperatures to flight threshold. When monarchs bask they open their wings and tilt them toward the sun. Like solar panels, monarchs capture the sun's energy by exposing the surface area of their wings directly to the sun.
Explanation:
I would assume because of where san francisco is i suppose that it just depends on where your located at
If the the can prevent their live from hunting