Searching for Northern Saw-Whet Owls

From Birds of North America (BNA) account of northern saw-whet owls:

“Owl response rates lower on nights with wind speeds above Beaufort 2 than nights with wind speeds of Beaufort 0-2 ()…Clark and Anderson () found that Saw-whet Owls were more vocal when cloud cover was between 50 and 75%…Owl populations may be more stable than auditory censuses suggest because more owls are known to be present than are calling in some years, based on pellet, roost, and roosting owl searches ()…Sing from within a half hour after sunset until sunrise. Calling peaks at 2 h after sunset and decreases until just before sunrise ().”

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