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Susan Kritzik writes: "The Western equivalent is the Ash-throated Flycatcher, which also nests in cavities, including Bluebird boxes. They have a lovely (?) "kabrik!!" call.

"They have the somewhat smelly habit of incorporating coyote scat in their nests. I suppose it may repel mammalian predators or insects. It is also a bit repellent to nestbox monitors! I assume snakeskin might startle avian predators and even mammals. There’s always an evolutionary reason for these things!"

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