—During our last trip into British Columbia, my wife and I spotted this swiss-cheese like pattern of holes in a cliff. The cliff was above a bank of the Kootenay River, one of the few rivers that crosses back-and-forth between Canada and the USA.
While it was too cold for migratory birds to have returned north, these nests are quite typical of bank swallows. Bank swallows are widespread in North America, being found in about 2/3 of states and all Canadian provinces.
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