<< Previous Next >>

Sneeuwuil


Sneeuwuil
Photo Information
Copyright: Thijs van Balen jr (Pentaxfriend) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 514 W: 24 N: 1888] (8048)
Genre: Animals
Medium: Color
Date Taken: 2007-08-31
Categories: Birds
Camera: Pentax K10D, Tamron 28mm-300mm, 62mm B+W Skylight KR1,5
Exposure: f/5.6, 1/100 seconds
Photo Version: Original Version
Date Submitted: 2007-09-18 7:14
Viewed: 3896
Points: 4
[Note Guidelines] Photographer's Note
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Strigiformes
Family: Strigidae
Genus: Bubo
Species: B. scandiacus
Binomial name :Bubo scandiacus (Linnaeus, 1758)


The Snowy Owl (Bubo scandiacus) is a large owl of the typical owl family Strigidae. It is also known in North America as the Arctic Owl or the Great White Owl. 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 owls in the genus Bubo.

Description :
This yellow-eyed white bird is easily recognizeable. It is 53-65 cm (20-26 inches) long with a 125-150 cm (50-60 in) wingspan. The adult male is virtually pure white, but females and young birds have some dark scalloping; the young are heavily barred, and dark spotting may even predominate. Its thick plumage, heavily-feathered feet, and coloration render the Snowy Owl well-adapted for life north of the Arctic Circle.
Snowy Owl calls are varied, but the alarm call is a barking, almost quacking krek-krek-krek-krek; the female also has a softer mewling pyee-pyee-pyee-pyee or prek-prek-prek. The song is a deep repeated gawh. They may also clap their beak in response to threats or annoyances. While called clapping, it is believed this sound may actually be a clicking of the tongue, not the bill.

Behaviour :
The Snowy Owl is typically found in the northern circumpolar region, where it makes its summer home north of latitude 60 degrees north. However, it is a particularly nomadic bird, and because population fluctuations in its prey species can force it to relocate, it has been known to breed at more southerly latitudes. During the last ice age, there was an Central European paleosubspecies of this bird, Bubo scandiacus gallicus, but subspecies are not recognized among the living population.

This species of owl nests on the ground, building a scrape on top of a mound or boulder. A site with good visibility, ready access to hunting areas, and a lack of snow is chosen. Gravel bars and abandoned eagle nests may be used. Breeding occurs in May, and depending on the amount of prey available, clutch sizes range from 5 to 14 eggs, which are laid singly, approximately every other day over the course of several days. Hatching takes place approximately five weeks after laying, and the pure white young are cared for by both parents.


De sneeuwuil (Bubo scandiacus, voorheen ook Nyctea scandiaca) is bij uitstek een toendra-uil.

In strenge winters wordt hij nog wel eens in Nederland waargenomen als dwaalgast. Maar zijn verspreidingsgebied is het uiterste noorden van AziŽ, Europa en Noord-Amerika. Daar leeft de overwegend witte sneeuwuil op de toendra, op zoek naar knaagdieren, zoals muizen en lemmingen. En daar nestelt hij.

De legselgrootte varieert met het voedselaanbod. In lemmingrijke jaren is het aantal eieren het grootst. Verschil tussen beide geslachten is er nauwelijks. In het algemeen hebben mannetjes een minder duidelijk gestreepte borst. In hetzelfde gebied leeft ook de iets grotere Laplanduil (Strix nebulosa).

Leace, pvb, marhowie has marked this note useful
Only registered TrekNature members may rate photo notes.
Add Critique [Critiquing Guidelines] 
Only registered TrekNature members may write critiques.
Discussions
None
You must be logged in to start a discussion.

Critiques [Translate]

  • Great 
  • pvb Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 385 W: 16 N: 531] (1981)
  • [2007-09-18 12:04]

Ah Thijs, je hebt de uil van Harry Potter hier mooi vast kunnen leggen.
Misschien een iets overbelichte verenpak op de buik, maar hij steekt mooi uit tegen de donkere achtergrond. Mooi oogcontact.
gr Paula

  • Great 
  • gannu Gold Star Critiquer/Gold Note Writer [C: 988 W: 4 N: 3277] (14761)
  • [2007-09-19 20:54]

Thijs, Beautiful shot and excellent view. The eye catch is superb and also the focus. Lovely Ganesh

Calibration Check
















0123456789ABCDEF