Creeping up the tree.

Brown creeper, Rondeau Provincial Park, Ontario, Canada, April 7, 2022.


Well named bird, it creeps up a tree looking for food then it flies to the bottom of the next tree and repeats.
Certhia americana
In Arizona, Brown Creeper nests often have two openings, one which serves as an entrance and the other as an exit. Entrances face downward and exits upward.
source - Cornell Lab of Ornithology.

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