A Red-tailed Hawk soars on broad, rounded wings, the epitome of effortless flight. Without flapping, it traces a leisurely, rising circle. The hawk is riding a thermal, a column of warm rising air generated near the earth's surface by heat from the sun. The Red-tail periodically circles to stay within the thermal. Riding thermals is an energy-efficient way to search for prey below.

More info and transcript at BirdNote.org.

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