One of the simplest explanations is food.
Many birds feed on insects, and insects can be especially abundant close to the ground, around grass, gardens, fields, ponds, and waterways.
You may see birds repeatedly swooping downward, turning sharply, and then climbing again.
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Weather
insects
That’s often a sign they’re hunting rather than predicting the weather.
And watching a flock chase insects can be quite a show!
They’re Avoiding Strong Winds
Wind can dramatically affect bird flight.
When strong winds are present, some birds may fly
