Asio otus wilsonianus, A. o. tuftsi
Status: Uncommon regular spring, fall, and winter visitor statewide. Rare regular resident statewide.
Documentation: Specimen: UNSM ZM12786, 9 May 1892 Waverly, Lancaster Co.
Taxonomy: There are four subspecies recognized, two in Eurasia and Africa, and two in North America (Gill and Donsker 2017): tuftsi from western Canada to northern Mexico, and wilsonianus from south-central and southeast Canada to south-central and eastern USA. Marks et al (1994) stated “Given nomadic tendencies of [Long-eared Owl], subspecific status in North America is questionable and needs further study.”
According to AOU (1957), the eastern subspecies wilsonianus occurs in Nebraska as a breeding bird; tuftsi is cited as breeding east to Saskatchewan. Thus, one banded as a juvenile in Alberta and recovered in Nebraska in early Dec would have been tuftsi, suggesting that at least some birds reaching Nebraska in winter represent this subspecies.
Resident: Although Marks et al (1994) show the breeding range extending south only to the northwestern third of Nebraska, nesting has been documented from all parts of the state; it is not a predictable repeat nester at any known location, however. It has been suggested that some Nebraska birds move south after breeding (Haecker et al 1945), but there is no evidence to support this; because breeding birds are thought to be resident except for northern parts of the breeding range (Marks et al 1994), it is highly likely that Nebraska breeders are resident. Indeed, Marks et al (1994) state: “Presumably a regular migrant in n. Canada, but commonly winters in breeding range throughout U.S. and s. Canada. Several individuals trapped at nests in Idaho and Montana recaptured at nearby communal roosts in winter ….” At Smith Lake WMA, Sheridan Co, reports are year-round, with as many as seven during 10-23 May 2007 (Steven Jones, pers. comm.).
Nesting has been documented as of 2017 statewide from 24 counties, and there are summer (May-Aug) reports from an additional 11 counties where nesting has not been documented.
Long-eared Owls use old crow and magpie nests as platforms, typically located in conifers, especially junipers (Mossman and Brogie 1983; Holcomb 1967; Held 1958; Bray 1994; Mollhoff 2001), but also in mixed junipers and hardwoods (Mossman and Brogie 1983) and in an elm in a shelter belt (Mathisen and Mathisen 1960).
- Breeding Phenology:
Eggs: 19 Mar-25 Apr
Nestlings: 9 May- 20 Jun
Fledglings: 17 May-16 Jun
Winter: Oct 21,22,26 <<<>>> Apr 19,20,20
Arrival is in late Oct. Long-eared Owls are most numerous in Nebraska during Nov-Mar, as birds arrive from north and northwest of Nebraska. Birds banded as juveniles in Alberta and Manitoba were recovered in Nebraska in early Dec and early Mar, respectively. These banding data suggest that birds reaching Nebraska in winter include at least some tuftsi (see Taxonomy).
Bent (1938) suggested that winter congregations consist of family groups, which may account for roost sites developing some degree of permanency as demonstrated by use in successive winters. A roost site near Cunningham Lake, Douglas Co was used for at least six winters; Ken Geluso (personal communication) has noted that this site was occupied 21 Nov- 28 Mar, with arrival related to developing snow cover in South Dakota, and that as many as 25 birds may be present although some or all may leave if snow reduces prey accessibility.
Roost sites are typically found in dense stands of vegetation, frequently junipers, as may develop in shelterbelts or on overgrown grazing land. Chosen sites are usually near a foraging area of open habitat such as grassland or fallow cropland that supports small rodents such as voles (Microtus sp.).
Departure of wintering birds occurs by mid-Apr and birds seen at that time may also be migrants; one at Holmes Lake, Lincoln 6 Apr 2013 was an apparent migrant, as none had wintered there. Based on egg dates, some spring reports as well as the following later reports may be of summering birds: 22 Apr 1962 Douglas Co, 23 Apr 2016 Schramm Park SRA, Sarpy Co 24 Apr 1971 Lancaster Co, 28 Apr 1957 Adams Co, 28 Apr 1957 Webster Co, 29 Apr 2011 Sarpy Co, 29-30 Apr 2000 Crescent Lake NWR, Cherry Co, and 30 Apr 1943 Adams Co.
- High counts: 39 at Lincoln, Lancaster Co 18 Dec 1977, 22 there 21 Dec 1980, and 19 there 19 Dec 1982 (these Dec counts are from CBCs). Eleven were at Cunningham Lake 18-24 Jan 2015.
NWR: National Wildlife Refuge
SRA: State Recreation Area
UNSM: University of Nebraska State Museum
American Ornithologists’ Union [AOU] . 1957. The AOU Check-list of North American birds, 5th ed. Port City Press, Baltimore, Maryland, USA.
Bent, A.C. 1938. Life histories of North American birds of prey. Part Two. Bulletin of the United States National Museum 170. Dover Publications Reprint 1961, New York, New York, USA.
Bray, T.E. 1994. Habitat utilization by birds in a man-made forest in the Nebraska Sandhills. Master’s thesis, University of Nebraska-Omaha, Omaha, Nebraska, USA.
Gill, F., and D. Donsker (Eds). 2017. IOC World Bird List (v 7.3), accessed 30 January 2018.
Haecker, F.W., R.A. Moser, and J.B. Swenk. 1945. Checklist of the birds of Nebraska. NBR 13: 1-40.
Held, D. 1958. Cherry County. NBR 26: 28-29.
Holcomb, L.C. 1967. Long-eared Owl nest in Nebraska. NBR 35: 56-58.
Marks, J.S., D.L. Evans, and D.W. Holt. 1994. Long-eared Owl (Asio otus), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, New York, USA. https://doi.org/10.2173/bna.133.
Mathisen, J., and A. Mathisen. 1960. Nesting study of Long-eared Owls in Box Butte Co. NBR 28: 10-11.
Mollhoff, W.J. 2001. 1999-2000 Nebraska nesting report. NBR 69: 92-101.
Mossman, M.J., and M.A. Brogie. 1983. Breeding status of selected bird species on the Niobrara Valley Preserve, Nebraska. NBR 51: 52-62.
Silcock, W.R., and J.G. Jorgensen. 2018. Long-eared Owl (Asio otus), Version 1.0. In Birds of Nebraska — Online. www.BirdsofNebraska.org