Have you ever wondered why birds tend to fly in circles? It’s because of thermals that occur when the sun heats up the Earth, and the air close to the ground gets warm and starts to rise. Those that especially tend to use this “flying in circles” mode are large raptors such as hawks, vultures, and eagles. And they often do it before storms. That's just one way animals and birds can predict bad weather - watch out for more signs like this.

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