Seasonal Movies

It's easier to see when that first leaf shows up on a tree than it is to see whenthat first leaf falls off. Birds will often have, at least in the northern hemisphere, their breeding season is in the summer. And so there are those kinds of things with certain animals. But if they don't get that chilling requirement, if we were to have a really warm winter, for example, and doesn't get cold enough for them to meet their chilling requirement then their spring phenology can be thrown off.

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