Denver-Boulder Metro Area: Birds

The spotted owl (Strix occidentalis) is a species of true owl. It is a resident species of old-growth forests in western North America, where it nests in tree holes, old bird of prey nests, or rock crevices. Nests can be between 12 and 60 metres (39 and 197 ft) high and usually contain two eggs (though some contain as many as four). It is a nocturnal owl, which feeds on small mammals and birds. Three subspecies are... less ↑

The Spotted Owl (Strix occidentalis) is a species of true owl. It is a resident species of old-growth forests in western North America, where it nests in tree holes, old bird of prey nests, or rock crevices. Nests can be between 12 to 60 metres (39 to 200 ft) high and usually contain two eggs (though some will contain as many as four). It is a nocturnal owl, which feeds on small mammals and birds. less ↑

The Burrowing Owl (Athene cunicularia) is a tiny but long-legged owl found throughout open landscapes of North and South America. Burrowing Owls can be found in grasslands, rangelands, agricultural areas, deserts, or any other open dry area with low vegetation. They nest and roost in burrows, such as those excavated by prairie dogs (Cynomys spp.). Unlike most owls, Burrowing Owls are often active during the day, although they tend to avoid the midday heat. But like... less ↑

The Snowy Owl (Bubo scandiacus) is a large owl of the typical owl family Strigidae. The Snowy Owl was first classified in 1758 by Carolus Linnaeus, the Swedish naturalist who developed binomial nomenclature to classify and organize plants and animals. Until recently, it was regarded as the sole member of a distinct genus, as Nyctea scandiaca, but mtDNA cytochrome b sequence data (Olsen et al. 2002) shows that it is very closely related to the horned... less ↑

The Short-eared Owl (Asio flammeus) is a species of typical owl (family Strigidae). In Scotland this species of owl is often referred to as a cataface, grass owl or short-horned hootlet. Owls belonging to genus Asio are known as the eared owls, as they have tufts of feathers resembling mammalian ears. These "ear" tufts may or may not be visible. Asio flammeus will display its tufts when in a defensive pose. However, its very short tufts... less ↑

The Boreal Owl (Aegolius funereus) is a small owl. It is also known as the Tengmalm's Owl after Swedish naturalist Peter Gustaf Tengmalm. Other names for the owl include Richardson's Owl, Funeral Owl (latin: funereus), Sparrow Owl, and Pearl Owl (Finnish: helmipöllö and Swedish: pärluggla). This species is a part of the larger grouping of owls known as typical owls, Strigidae, which contains most species of owl. The other grouping is the barn owls, Tytonidae. less ↑

The flammulated owl (Psiloscops flammeolus) is a small, nocturnal owl approximately 15 centimetres (6 in) long with a 36 centimetres (14 in) wingspan. Males and females can be distinguished by their weight. Females are larger, ranging from 62–65 grams (2.2–2.3 oz) and males are smaller ranging from 50–52 grams (1.8–1.8 oz). The owl gets the name flammulated from the flame like markings on its face (Bremiller, 2003). It breeds from southern British Columbia and the western United States to central... less ↑