Sabtu, 14 Juli 2012



The Biggest Animals Kingdom and in The World | Owl | Owls have large forward facing eyes and ears of holes, a hawk-like beak, a smooth face, and usually a remarkable circle of feathers, a facial disc in each eye. Most birds of prey sport eyes on the sides of their heads, but the nature of the owl stereoscopic eyes face forward makes greater sense of depth perception needed for low light hunting. Owls can turn the head and neck as much as 270 degrees in either direction. Prisoners captured by owls with filoplumes felt like feathers on the beak and feet as "antennae".


The lower owl weighs only 31 grams (one ounce) and measuring approximately 13.5 cm (5 inch) is the owl Elf (Micrathene whitneyi). Around the same time small, but slightly heavier, the least known long whiskered Owlet (Xenoglaux loweryi) and Tamaulipas Pygmy Owl (Glaucidium sanchezi). The largest owl by length is the Great Grey Owl (Strix nebulosa), representing about 70 cm (28 cm) measured average and can reach a length of 84 cm (33 in). However, the heavier (and winged) are also two great horned owls, the Eurasian Eagle-Owl (Bubo bubo) and Blakiston's Fish Owl

Different kinds of owls make different sounds, this wide range of tools called owls to find friends or announcing their presence to potential competitors, and also helps ornithologists and birders in locating these birds and recognizing species. As mentioned above, the owls facial disc helps to channel the sound of prey to their ears. The plumage of owls is usually cryptic, but many species have the head and facial markings such as masks, ear tufts and brightly colored iris. Owl a generally egg white and the near-spherical in shape and vary in number from a few tens, depending on species.


Most owls are nocturnal, they hunt their prey in the dark alone. Different kinds of owls are active during twilight the twilight of dawn and dusk: an example is the Pygmy Owl (Glaucidium). A few owls are active during the day too, the examples are the Burrowing Owl (Speotyto cunicularia) and Short-eared Owl (Asio flammeus). Much of the strategy of hunting owls depends on stealth and surprise. Owls have at least two adaptations that help them in achieving stealth. Secondly, serrated edges on the front of remiges owls to silence an owl wing beats, making a flying owl for almost silent. Some fish eating owls, where silence has no evolutionary advantage, lack this adaptation.

An owl sharp beak and powerful claws allow it to kill their prey before swallowing it whole (if not too large). Some owls are also designed specifically for the fish to hunt. Most owls share an innate ability to fly almost silently and also slower compared to other birds of prey. A flight, quiet slow is not needed for day and evening feeding owls usually see an owl approaching. Jagged edges along remiges owl to bring the successes of the wing to a mechanism almost silent. This reduction unique structure of sound frequencies above 2 kHz, thereby reducing the noise spectrum covered by the hearing typical conventional attached owl. and also within their own scale audience better than the owl, the owl This optimizes the ability to fly silently to capture prey without the prey hear the owl, the first as he flies in. It also allows the owl to monitor to keep the sound their pattern of flight. The systematic placement of owls is disputed.

There are some owls 220-225 extant species, divided into two families: the typical owls (Strigidae) and barn owls (Tytonidae). The supposed "owls" Cretaceous Heptasteornis Bradycneme and are apparently not maniraptors avialan. In the early Neogene, families have been displaced by other bird orders, leaving only barn-owls and typical owls. The last time were usually a fairly common species (probably earless) owl similar to today's North American Spotted Owl or the European Tawny differences in size and ecology found in typical owls today developed only later.

Limits around the Paleogene-Neogene (about 25 million years), owls were the dominant group of owls in southern Europe and adjacent Asia at least, the distribution of fossil and modern owl lines indicates that the decline is contemporary with the evolution of the various main lines of the typical owls, for the most part seems to have occurred in Eurasia. In America, there was rather an expansion of immigrant lineages of ancestral typical owls. The supposed fossil herons "Ardea" perplexed (Middle Miocene of Sansan, France) and "Ardea" lignitum (Late Pliocene of Germany) were probably owls, the latter was apparently near the modern genus Bubo.
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