why ostrich dose n' t fly?
535598
Their wings are too short and they weight to much to fly!
679764
My pet Emu -Larry- says you are mistaken. In reality birds do not fly. See, you were outside, enjoying a lovely day when you stumbled upon a group of kids playing in the park. What you saw was nothing more than a fowl ball.
387339
There has been a study done and in over 60 years, there has never been a reported case of an ostrich burying its head in the sand.\n\nPure myth
755713
No, you don't tend to wonder these things when you know why.\n  \nIt's to do with the air currents.  By flying in a V formation the birds behind save up to 30% of energy.  When the leading bird gets tired he drops out and goes to the end of the formation and one of the birds next in sequence takes his place, so they still maintain the V formation.  This process continues until all the birds come to rest.\nIf a bird gets injured and needs to land to earth, two other birds will also break away and stay with the injured bird until he gets well or until he dies, before resuming their flight.
454243
Your bones are too dense. \n\nNo joke, the reason birds are capable of flight is due to having hollow bones, making them far lighter.
580440
Birds. Just to fly they'd need more brain power.
1042915
It depends on the species of bird. Some it may take months, some weeks, some a week, and others just a few days. It also depends on the health of the parents and baby. If the parents are healthier they can take better care of the baby so it will be healthier and can fly sooner. Also a healthier parent will teach the baby sooner and quicker. But some bird such as the ostrich, emu, and South American rhea do not fly. Sorry I was unable to be more specfic as it would have been impossible to give you an exact time period. After originally answering this question you e-mailed me saying that the birds were sparrows. Sparrows are small birds and as such, will learn to fly quickly. It may be anywhere around 6-14 days.
698699
Somewhere I read that their spray mechanism involves an eversible gland. If the gland is already out when you pick up their tail, it's too late for you. But if it hasn't, then they can't evert it with their body weight on their tail. There's no way to see it so it's mighty risky.
90244
After covering some distance, fuel is burnt in the truck & hence, its weight is reduced. Thus, the bird's weight does not  stop the truck!
1050300
It was a swallow....\n\n\nArthur: The swallow may fly south with the sun or the house martin or the plover may seek warmer climes in winter, yet these are not strangers to our land? \nSoldier #1: Are you suggesting coconuts migrate? \nArthur: Not at all. They could be carried. \nSoldier #1: What? A swallow carrying a coconut? \nArthur: It could grip it by the husk! \nSoldier #1: It's not a question of where he grips it! It's a simple question of weight ratios! A five ounce bird could not carry a one pound coconut. \nArthur: Well, it doesn't matter. Will you go and tell your master that Arthur from the Court of Camelot is here? \nSoldier #1: Listen. In order to maintain air-speed velocity, a swallow needs to beat its wings forty-three times every second, right? \nArthur: Please! \nSoldier #1: Am I right? \nArthur: I'm not interested! \nSoldier #2: It could be carried by an African swallow! \nSoldier #1: Oh, yeah, an African swallow maybe, but not a European swallow. That's my point. \nSoldier #2: Oh, yeah, I agree with that. \nArthur: Will you ask your master if he wants to join my court at Camelot?! \nSoldier #1: But then of course a-- African swallows are non-migratory. \nSoldier #2: Oh, yeah... \nSoldier #1: So, they couldn't bring a coconut back anyway... \n[clop clop clop]\nSoldier #2: Wait a minute! Supposing two swallows carried it together? \nSoldier #1: No, they'd have to have it on a line. \nSoldier #2: Well, simple! They'd just use a strand of creeper! \nSoldier #1: What, held under the dorsal guiding feathers? \nSoldier #2: Well, why not?
65881
I assume you mean why do turkey's have wings.\nAnd the answer would be, to fly. While domestic turkey's do not fly (because their wings are clipped), wild turkey can fly very well.
395355
It is used to describe an event that couldn't possibly happen....\n\nhttp://en.wikipedia.org/wiki/When_pigs_fly
61716
The air inside the vehicle is moving the same speed as the vehicle. To the fly it's still air, unless a window is open, then the fly may not be able to fly normally.
1116793
When pigs learn to fly and are too fast to catch.
179025
Some birds will fly away from their nests as a way to distract a threat. Or they will fly at a predator in an attempt to annoy them. If they're large enough or persistent enough, they may also use their beak or feet/talons to cause injury.
295910
I am willing to bet that you are looking for the Elephant.  There are many sites on the web which have stated that the elephant is the only mammal which can not jump.  This is NOT the truth.\nJust on the Web alone there are several others listed including the okapi, guinea pig and raccoon who are also reported as not being able to jump.  (see references).\nIn the same class as the elephant, both Hippopotamus and Rhinoceroses come closer to skipping than jumping.  Like the elephant, their body mass is too great in relation to their mass.\nIn addition, all bats have weak legs and usually have trouble walking, let alone jumping.\nIt has been recorded that sloths move too slow to jump.  Plus they seldom climb down out of their trees.\nGiraffes are known to run, but apparently always have one “foot on the ground.”  Due to their neck structure, it may not be possible for them to jump in the usual meaning of the word.\nDue to their odd physical shapes and relatively slow speeds, echidna (spiny anteater), \nduck-billed platypus and koala might also be listed among the non-jumpers.\nFinally, there are the non-land mammals most of which can come at least part way out of the water, but none have legs and by definition, can not jump.  These would include whales, porpoises, dolphins, manatees and maybe even sea lions.
478788
Its definately an OSTRICH! they are the only animals or birds that have a brain smaller than their eyes!