By Hans Peeters
Such a lot owls are virtually completely tailored to existence at nighttime. Their vaguely humanoid faces mirror the mind-blowing evolution in their listening to and imaginative and prescient, which has made flight, romance, and predation attainable within the close to absence of sunshine. This obtainable advisor, packed with fascinating anecdotes, covers all 19 species of owls happening in North the USA. greater than an identity consultant, Field consultant to Owls of California and the West describes the biology and behaviour of owls to make discovering and deciding upon them more straightforward and observing them extra relaxing. The advisor additionally explores the conservation demanding situations that owls face and tells how owls supply insights to scientists operating in fields from expertise to overall healthiness.
- Color plates illustrate every one species
- Range maps express the western distribution of North America's owls, 14 of which happen in California
- Offers tips for locating and observing owls
- Gives details on how one can layout, position, and hold nest boxes
- Describes human attitudes towards owls via historical past, together with in local American cultures of the West
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Additional info for Field Guide to Owls of California and the West (California Natural History Guides, Volume 93)
6/15/07 9:20 AM Page 45 Fig. 36. Some owls look like accident victims when they sunbathe. Burrowing Owl shown. Fig. 37. This Northern Sawwhet juvenile is using a floor lamp for “sun” bathing, mistaking the light for a patch of sun. excitedly run about in the rain, and Western Screech-Owls and Flammulated Owls nearly submerge themselves with great enthusiasm. All deliberately wipe their beaks afterward. At least some of the species also sunbathe. Great Horned Owls bathe in ﬁne sand, and their elongate scrapes, often with a few molted feathers, can be found on woodland dirt roads (B.
Rods (for black-and-white vision under low-light conditions) comprise 80 percent of the light receptors, the remainder being cones (for color vision), which, AN OWL’S BODY 19 Peeters-1:v. 6/15/07 9:20 AM Page 20 Fig. 14. Skulls of a Red-tailed Hawk (left) and a Great Horned Owl (right). The hawk has prominent supraorbital ridges that shield the eyes, and the owl has enormous sclerotic rings to support the exposed eyes in their very shallow orbits. however, require bright light to function. Owls also lack the capacity to perceive ultraviolet (UV) light, important to some other birds (Bowmaker and Martin 1978).
Next, the light continues through the lens and ﬁnally reaches the retina, the camera’s ﬁlm, where highly specialized nerve cells form an image that is passed on to the brain for recognition or interpretation. The actual shape of birds’ eyeballs is variable; some are roughly spherical, like a human’s; others are ﬂatter, as in waterfowl, for example; and those of diurnal raptors are conical. The distinctive great size of most owls’ eyes is the result of the major enlargement of the cornea, pupil, and lens to admit maximum light under low-light conditions.