Roosts of Northern Saw-whet Owls in southern Wisconsin

Article Abstract:

A study was conducted to analyze the patterns of roost-site selection of Northern Saw-whet Owls (Aegolius acadicus). Roosts of 623 Saw-whet owls were observed in southern Wisconsin from 1986 to 1990. The study showed that a high proportion of roosts were placed in spruce, pine and cedar trees, with an average height of 4.05m. The main criterion for choosing roost-sites was dense coverage around the site that would conceal the roost from predators and provide other thermal advantages for the owls.

Ornithological research, Wisconsin

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Renesting by spotted owls

Article Abstract:

Renesting by spotted owls takes place comparatively infrequently. Renesting occurs rarely due to three reasons. One reason is that juvenile spotted owls have a comparatively long period of parental care, typically from the time of hatching in late April or May until August or September or their first summer. A second factor is that females usually lose weight during the incubation period. The third reason is that perhaps renesting can be ascertained only if the identity of the female is known.

Nest building

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The boreal owl at the southern terminus of the rocky mountains: undocumented longtime resident or recent arrival?

Article Abstract:

A Boreal Owl survey was conducted in the New Mexico and Arizona mountains to determine the bird's distribution patterns, potential habitat in other locales, breeding within occupied habitat and southern breeding limits. The survey was also done to determine residency of the bird in the region. Twenty records of the Boreal Owl between 1987 and 1993 establishes the bird as a resident in the mountain areas of New Mexico.

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