For most organisms, we find that it's temperature. And or at least I should say for plants, it's definitely temperature for birds. It's probably a combination and even other behavioral factors like birds' consensus that they've been in a location for a particular amount of time and heck, it's just time to leave. Near the equator, are the seasons less distinct? Yes.
The seasons are a-changin'! It's sweater weather in both hemispheres and seasonal researcher and expert Phenologist Dr. Libby Ellwood weighs in with amazing information about why fall smells so good, why leaves change color, why we like to cronch them, historical records of blossoms and twigs, bird migrations, Daylight Savings, seasonal mythbusting, pumpkin spice vs. apple cider, the best temperature to wear sweaters, why the Halloween aisle springs up in summer and how global temperature shifts affect the whole food web. Bonus: the most candid, touching thoughts Alie's ever heard from a scientist studying climate. Get this one in your ears and hearts.
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