how high do eagles build their nests?
458324
Bald eagles can build their nests in trees or sometimes right on the ground. A nest can weigh 2,000 pounds over many years as new materials are constantly added to the nest to solidify its structure and can actually fall out of the tree. These beautiful birds frequent locations that are very high above sea level. In some cases they are 7,000 feet above sea level but might onle be 40 or 50 feet off the ground in a tree.
209415
They sleep in nests which are made of twigs and leaves and the interior is lined with fur, feathers or other soft material for comfort.  There are normally two exits in the nest, and they are built high in a tree between two strong branches.  They build their nests high enough to provide protection from ground predators, yet not too high or the nest will be destroyed by the winds.  Squirrels also will build a nest in a hollowed-out tree cavity.
45990
All birds go through specific growth phases- tiny/fluffy/non-flying, then medium big and learning to fly, then full grown.\n\nBy the time ANY bird learns to fly it usually looks full-grown and is about the size of an adult.\n\nThe tiny baby pigeons are in well-hidden nests on buildings. We see the others all the time.
278298
Several miles.  They can also fly high enough that you can't hear them.
138410
Crested Cormorants typically nest in or around Denver in the summer months, around April - July, but they are not a very common bird there anyway.
1087265
About one fly height.
441057
An immature bird has speckled brown feathers all over, the distinctive head and body plumage arriving 2–3 years later, before sexual maturity. Adult females have a wingspan of approximately 2.1 meters (7 feet); adult males have a wingspan of 2 meters (6 feet, 6 inches). Adult females weigh approximately 5.8 kg (12.8 lb), males weigh 4.1 kg (9 lb).\n\nhttp://en.wikipedia.org/wiki/Bald_eagle
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178feet above sea level.
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Yeah.......according to Bette Midler (a fine but lesser known boy scout fan) You can't fly higher than an Eagle!
1087442
There have been plenty of studies but nobody seems to have a good answer!\n\nI visited a zoo last Sunday (my kids took me, lol) and there were plenty of sparrows there - nesting as well.\n\nhttp://www.birdsofbritain.co.uk/bird-guide/house-sparrow.htm
544074
About 30m (100 ft) high.
603357
Some owls, like the eagle owl, will attack if you go near their nests with young. As they have heavy talons and a sharp beak they can be pretty dangerous.
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The highest fllying recorded so for is - a griffon. See below more details:\nthe mid 1980's was a Ruppell's griffon, an African vulture, struck by an airliner at 37,000 feet.\nAnother vulture, a lammergeyer was seen over "its mountain home" at 25,000 feet over Mt. Everest; alpine choughs have been recorded nesting at 27,000 feet on Mt. Everest. A mallard was struck by an airliner at 21,000 feet over Nevada. Records of smaller birds, also from hitting airplanes, are mostly\nfrom 7,000 to 12,000 feet. See Terres, Audubon Society Encyclopedia of North American Birds.\nVR
585391
American Harpy Eagle is a neotropical eagle, Harpia harpyja often ambigously called the Harpy Eagle. It is the New World's largest and most powerful eagle, and is found in lowland tropical rainforest from southern Mexico to northern Argentina.\n\nThe Harpy Eagle is 100 cm (3.5 ft.) long with a 200 cm (6.5 ft.) wingspan and weighs 8 kg (18 lb.). Females are larger and heavier than males. It is dark grey overall, with an ash-grey head, and white belly. Both sexes possess an erectile crest of long feathers. The talons are up to 13 cm (5 in.) long.\n\nThis species is an actively hunting carnivore. Its main prey items are tree-dwelling mammals such as monkeys, coatis, sloths, etc; it may also attack other bird species. It can be aggressive towards humans who disturb its nesting sites or appear to be a threat to its young.\n\nThe Harpy Eagle is threatened by logging and hunting throughout its range. Harpia harpyja is on the IUCN red list of endangered species.
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Blackbirds utilise a variety of nest sites including trees, bushes, hedges and buildings, or may even nest directly on the ground. The female builds the nest from sticks, twigs and leaves, and lines it with mud and grass.
466453
the ostrich is the tallest bird and it can grow up to 8 feet in height
306921
Well, the bald eagle now nests in 49 states in the US--only Vermont doesn't have a breeding population, although there are transients. Bald eagles are fish eaters, so they need clean, open water and undisturbed forests. Away from water, they are plains hunters as well, and again need wide, open areas.\n\nThey don't like any sort of urban area, and polluted fish will kill them pretty quickly.