This was recorded early on the morning after summer solstice on the Chimney Crater lava flow in the Medicine Lake Highlands in Shasta-Trinity National Forest, Siskiyou County, California. Numerous Common Nighthawks were flying around over the lava flow hoping to find a mate. The recording starts before dawn at about 3 am and continues until sunrise.

The nighthawks call frequently as they fly around, and the males occasionally make their "boom" sound which is made by their wing feathers as they dive.

If you'd like to learn more about Common Nighthawks, here is a link the Wikipedia article about them-

Common nighthawk - Wikipedia

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I really hope you enjoy this recording. Please do something today, and everyday, that helps preserve the natural world for future generations. Thank you very much for listening. Stay healthy, stay safe, stay sound.