It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by undo
Bone density. So pterdactyl's had fragile bones?
Guys, you're moving the bar all over yonder. That horizon is infinitely receeding!
On the one hand, the issue can be explained by appealing to "only what's needed", on the other hand, the issue can be explained by appealing to randomness or high order or high disorder or, whatever the bar needs to be in order to keep that baby in the corral!
Originally posted by Zaphod58
Originally posted by undo
Bone density. So pterdactyl's had fragile bones?
Guys, you're moving the bar all over yonder. That horizon is infinitely receeding!
On the one hand, the issue can be explained by appealing to "only what's needed", on the other hand, the issue can be explained by appealing to randomness or high order or high disorder or, whatever the bar needs to be in order to keep that baby in the corral!
Most birds, and flying critters have very fragile bones. The denser the bone the heavier and stronger it is. The heavier it is, the harder it is to fly, and the more energy it takes. If you have dense bones in a bird they'd have to eat constantly to have enough evergy to fly, if they were even light enough to get off the ground.
Pursuit (Attack). Several modes recognizable: stoop, ringing up, direct pursuit, contour-hugging, shepherding, running or hopping, and flapping on ground (see also Behavior: locomotion, below). Stoop is well-known mode: dive from above quarry, varying from 1,000 m long and from 90° angle to horizontal to
THINGS WITH WINGS PEREGRINE FALCON
How is this falcon like a football player?
The peregrine falcon has black markings
under its eyes, like many football players put on. This helps absorb sunlight below the
eyes to cut down on the glare. It helps them see to assist with their hunting.
Like all living things, the peregrine falcon needs to get energy to survive. Put these actions in the
order that they occur so a peregrine can survive. Put a 1 to show the first thing.
peregrine pulls the prey apart
prey drops toward the ground
special “tooth” or notch in peregrine’s beak is used to bite and sever spinal cord at the
neck (prey is killed quickly)
hits prey with its breastbone
peregrine swallows its prey
peregrine grabs prey with its talons (curved claws) powered by strong feet
About how fast can the peregrine fly in a dive?
200 miles an hour!!
There is a weight limit for a flapping bird. The heavier the animal, the bigger its wings need to be. The bigger the wings, the more muscle is needed to move them. The biggest flying bird today is called the Great Bustard. They weigh as much as 32 pounds and are 4 feet long.
The best way to fly is to be light. So most birds are small. Birds have feathers that are very light weight. The bones that birds have are also made for lightness. Birds have less bones than most animals. The bones they have are hard but thin. The biggest bones in flying birds are the breast bone and the shoulder bones.
Some birds have bones weighing less than their feathers. The powerful flying birds have medium weight skeletons. Birds that don't fly have the heaviest skeleton. In birds many bones are fused together. In this way not as many muscles are needed. The biggest muscles a bird has are its flight muscles. These are very strong because they have to raise the entire body into the air.
Birds have a lot of adaptations for flight. Their bones are hollow and light, but strong, They have light feathers which catch the air. They can fold up their wings when they are not in use. Their lungs are extra efficient at extracting oxygen from the air (we huff and puff when running, and flying is much harder!). They eat huge amounts of high-energy food, relative to their body weight.
Many birds have hollow bones to reduce their weight. (Check this site for more information on the adaptations of the skeletons of birds.) These special bones are very strong though, to cope with the forces necessary for flight. (Birds that do not fly but dive need the weight of solid bones. Penguins are in this category.) Instead of relatively heavy teeth, birds have light jaws and beaks. The gizzard, present in many birds and used for digestion, is in the middle of the body, and helps keep the bird steady when flying.
Even the reproductive organs are specialized to reduce size. A female bird has only one ovary which is normally very small. During breeding season, this one ovary will increase up to 1,500 times in size. She will become more reliant on the male to bring her food during this time when her flying is impaired.
An interesting link is from the Cincinnati Zoo where they have an exhibit showing children their shape and weight if they were a bird! To achieve and maintain flight, a bird has to have tremendous muscles. Over 30 percent of a hummingbird's weight is in its flight muscles. In fact, the flapping motion is one of the most strenuous activities in the entire animal kingdom. The heavier the bird, the more difficult is flight. The top weight range of flying birds is about 20 - 30 pounds. Examples that come to mind of this upper limit are mute swans, California condors, and some pelicans.
Originally posted by melatonin
Hi Rren,
Hope your well
I'd heard of such mutations before. Isn't it more of a case that there are predictable mutations under certain circumstances at certian parts of the genome? So the genome is biased towards certain mutations due to intense selection pressures?
Have you ever LOOKED at the breastbone of the chicken you're munching on?
Originally posted by SportyMB
Have you ever LOOKED at the breastbone of the chicken you're munching on?
Umm, sorry to break the news to you, but domestic chickens have lost the ability to fly.
Originally posted by chaiyah99
You're convincing me that this is not a friendly place.
Originally posted by SportyMB
Umm, sorry to break the news to you, but domestic chickens have lost the ability to fly.
birding.about.com
An interesting link is from the Cincinnati Zoo where they have an exhibit showing children their shape and weight if they were a bird! To achieve and maintain flight, a bird has to have tremendous muscles. Over 30 percent of a hummingbird's weight is in its flight muscles. In fact, the flapping motion is one of the most strenuous activities in the entire animal kingdom. The heavier the bird, the more difficult is flight. The top weight range of flying birds is about 20 - 30 pounds. Examples that come to mind of this upper limit are mute swans, California condors, and some pelicans.
Originally posted by chaiyah99
You're convincing me that this is not a friendly place.
Wow... well someone better tell the chickens! I had chickens on my farm, they can still fly. (Not long flights, but they can fly none the less.) I have seen them fly 20 to 30 feet across and up into trees as high as 10 to 12 feet.
www.urbanext.uiuc.edu...
Domestic chickens have essentially lost the ability to fly. Heavy breeds used for meat production cannot do more than flap their wings and jump to a little higher level or move more rapidly along the ground. The lighter-bodied birds can fly short distances, and some can fly over relatively high fences. The feet and shank portions of the legs have scales.