the flicker is a woodpecker,colaptes auratus.

A yellow-shafted flicker is a yellow songbird in the hummingbird family, Latin name Colaptes auratus.

why do my lights flicker and interior lights flicker

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Flickers are related to woodpeckers. They use their beaks to locate insects that live in, on, or under the bark of trees. They also get some nutrition from some sap that may occasionally accompany the insect as they are eating it.