Selective Bird
I don't get birds?
Humming birds zip up and down and left and right really fast
Eagles soar and are very selective with their flight plans.
Blue Birds just seem to glide.
Why do these birds all fly so differently. I thought flight was kinda fixed principle...I don't get it... I just don't get it.
Looking at the shape of a bird's wings is a simplified way to understand types of flight.
Flight comprises two elements: lift and thrust.
-The middle part of the wing (forearm) is an airfoil, and provides lift. Birds that have relatively long radius and ulna and long secondary feathers, that is, greater lift surface area, are good gliders (i.e. albatrosses, vultures).
-The more distal part of the wing (hand) provides thrust. The primary feathers are propellers, thus birds with relatively large hands and more developed, longer primaries are good at fast precision flight (i.e swifts, hummingbirds).
- Most birds are in between these extremes. An index called "aspect ratio" (wing length/width) is a good indicator of the relative lift of the wing.
And flying modes are related to the ecology of the species: where it lives, what it eats, how does it get its food, etc.
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African Spoonbill (Platalea alba), Kruger National Park, South Africa, Africa Photo Mugs
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DescriptionAfrican Spoonbill (Platalea alba), Kruger National Park, South Africa, Africa. Features
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American Avocet (Recurvirostra americana), Belmar Historic Park, Lakewood, Photo Mugs
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DescriptionAmerican Avocet (Recurvirostra americana), Belmar Historic Park, Lakewood, Colorado, United States of America, North America. Features
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Canada, British Photo Mugs
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DescriptionCanada, British Columbia,Common Loon, breeding plumage, adult, chick, feeding.. Features
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Row of Chickens and Cocks with Selective Focus - 24"W x 16"H - Peel and Stick Wall Decal by Wallmonkeys
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DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies... Features
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Birthday..Selective Colouring Card
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Description5 x 7 inch premium quality folded paper greeting card. Birthday cards for the whole family are available at Greeting Card Universe. Show your loved ones you care with a custom paper card to celebrate their birthday... |
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Photo Jigsaw Puzzle of Canada, British from Danita Delimont
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DescriptionPhoto Puzzle, Canada, British. Canada, British Columbia,Common Loon, breeding plumage, adult, chick, feeding. Chosen by Danita Delimont. 10x14 Photo Puzzle with 252 pieces. Packed in black cardboard box of dimensions 5 5/8 x 7 5/8 x 1 1/5... Features
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Photo Jigsaw Puzzle of Northern Cardinal from Danita Delimont
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DescriptionPhoto Puzzle, Northern Cardinal. Northern Cardinal (Cardinalis cardinalis) female bathing. Chosen by Danita Delimont. 10x14 Photo Puzzle with 252 pieces. Packed in black cardboard box of dimensions 5 5/8 x 7 5/8 x 1 1/5... Features
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Photo Jigsaw Puzzle of Northern Cardinal from Danita Delimont
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DescriptionPhoto Puzzle, Northern Cardinal. Northern Cardinal (Cardinalis cardinalis) female bathing. Chosen by Danita Delimont. 10x14 Photo Puzzle with 252 pieces. Packed in black cardboard box of dimensions 5 5/8 x 7 5/8 x 1 1/5... Features
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