Wednesday, February 29, 2012

Owls and Vutures


Owl and Vulture: Description
Owls
Class: Aves (Birds)  
Order: Strigiformes (Owls)
Family: Tytonidae (Barn Owls) or Strigidae (Typical Owls)
Description: Large round head with forward- facing eyes, sharp downward-facing beak, female can be up to 25% bigger than males.
Owls are Birds of Prey that have great vision and hearing. Talons and beak are strong.
Pellets are regurgitated after meals and contain indigestible parts of prey. 



Eastern Screech Owl
 http://www.houstonaudubon.org/default.aspx?act=newsletter.aspx&category=Bird%20Gallery&newsletterid=302

Megascops asio
Small, nocturnal owl.
2 color morphs: grey phase and reddish-brown phase
Adult (grey): facial disks white with grey-brown mottling, black border. Yellow iris. Grey-green beak
Juvenile (grey): like adult but indistinct stripes and bars more patterned with white tips of feathers.
Adult (red): cinnamon instead of grey
Juvenile (red): greyish brown, bars and stripes less pronounced than adult.
Fast flying  with broad wings  and head tucked in while in flight.
 

 Barred Owl
http://duncraft.atom5.com/barred-owls-3542.html
Strix varia
Medium sized gray to brown with horizontal barring on the chest and vertical barring on the stomach.
Round head with white/brown facial disk with brown trim.
Eyes are brown and the beak is yellow.
They have a long tail 
  •         Male and female plumage appears very similar.
Barn Owl 
http://www.owl-pictures.com/barn_owl.html
Tyto alba
Upper body light grey with small dark lines and dull spotting on feathers.
Underparts are white
The facial disk is white with a brown edge and brown markings near the front of the eyes.
Off white beak with yellowish-white to brown feet.
Females and juveniles have more spots.
  •         Females and males are about the same size.
Great Horned Owl
 http://www.oregonzoo.org/Cards/BirdsOfPrey/greathornedowl.htm
Bubo virginianus
First seen in the Virginia Colonies
Vary in color from a reddish brown to grey or black and white
Eyes are large with yellow to orange color
Underside is light grey with dark bars and a white band of feathers on the upper breast
Feathers form tufts that look like “horns”
Large feet have feathers that reach to the ends of toes
Juveniles  appear similar to adults
Females are  about 15% larger
 
Vultures 

Consist of New World and Old World
Some have an unusually bald head that does not require much clean after eating.
7 extant species of New World
Many species are endangered
Found on every continent except Australia  and Antarctica.
Black Vulture
http://www.arkive.org/american-black-vulture/coragyps-atratus/ 

Order: Falconiformes.
Family: Cathartidae. (New World vulture).
Scientific Name: Coragyps atratus
Large size
White patch at tip of broad wings
Dark gray wrinkled head lacking feathers
Prefers soaring on thermals
Juvenile does not have wrinkled skin.

Turkey Vulture 

 http://www.calliebowdish.com/TurkeyVulture.htm

Order: Falconiformes.
Family: Cathartidae. (New World vulture).
Scientific Name: Cathartes aura.

Large, dark coloration, wings broad, long tails, wings held slightly elevated when in flight.
Dark brown with a red head that lacks feathers, pale billFeathers near the wingtips and edge are more lightly colored.
 

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