Studies on Energy Budget in a Captive Long-eared Owl Asio otus

Status of the Short-eared Owl (Asio flammeus) in Alberta

The Hunting Behavior of Eastern Screech-owls (Otus asio)

—We studied the nocturnal hunting behavior of eight radiotagged Eastern Screech-owls (Otus asio; five females and three males) during the period from November 1994 through March 1995. Screech-owls selected low perches when hunting (x = 1.66 m), presumably to obtain a clear view of the ground and an unobstructed flight path to prey. Low perches may also improve the ability of screech-owls to hea...

Snowy Owl Predation on Short-eared Owls

A problem confronting Snowy Owls (Nyctea scandiaca) in their southern incursions is the shortage of food. This difficulty is raised by the presence of other raptors that feed on small mammals. This note shows how little food is found by migrant Snowy Owls and indicates a complex temporary ecological solution. At Tatoosh Island, Washington (48”24’ N, 124” 44’ W) on 25 November 1973, we observed ...

The morphology of juvenile stages of Bubophilus aluconis Nattress and Skoracki, 2009 (Acari: Syringophilidae) with a description of a male.

The morphology of juvenile and adult stages of the quill mite Bubophilus aluconis Nattress and Skoracki, 2009 parasitizing the Long-eared Owl Asio otus (Linnaeus) (Aves: Strigiformes) in Poland is described and illustrated. Poland is a new location and A. otus is a new host species for B. aluconis. A description of the male is presented for the first time for this quill mite species.

ELECTRORETINOGRAMS AND RETINAL STRUCTURE OF THE EASTERN SCREECH OWL <i>Otus asio</i> AND GREAT HORNED OWL <i>Bubo virginianus</i>

Electroretinograms (ERGs) were recorded from 2 species of owls: Eastern Screech Owl (Otus asio) and Great Horned Owl (Bubo virginianus). Dark adaptation and flicker stimuli were used to determine retinal activity and to infer retinal structure. The dark adaptation results howed typical patterns associated with retinas composed primarily of rods. This was indicated by the late regeneration of th...