"Like most woodpeckers, Northern Flickers drum on objects as a form of communication and territory defense. In such cases, the object is to make as loud a noise as possible." https://www.allaboutbirds.org/guide/Northern_Flicker/lifehistory
"Flicker drumming lasts about a second, during which the bird strikes the tree around 25 times. Drumming in woodpeckers takes the place of singing in songbirds." https://www.allaboutbirds.org/guide/Northern_Flicker/sounds
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