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they build their nests on the ledges
First understand that Peregrines do not build nests but make a shallow bowl which they scratch out with their feet. Urban Peregrines do this in roof shingle, pigeon remains or other available debris. Sea cliffs and mountsides are the places in nature that falcons make it's home.
Bare cliff ledges or the abandoned nests of other birds. They do not build their own nests.
Eagles will build their nests on ledges high up on rock faces, or in the tops of tall trees.
Several of the mountain ledges had bird nests on them.
The peregrine generally lays two to six eggs, usually in a nest high on cliffs or tall buildings. Falcons often use nests that were built by other birds located in these kinds of areas that are relatively inaccessible except by air.
The Peregrin nests on cliff ledges, crags, quarry faces, sea cliffs or (recently) tall buildings, and so tends to be restricted to these areas.
There are no figures for the peregrine falcon population in Australia. Although native to Australia and found in all states and territories, their numbers are not high. A map showing where known nests are found can be seen at the related link below.
they sleep in nests on tall mountains or nests in trees.
Eagles will build their nests on ledges high up on rock faces, or in the tops of tall trees.
Peregrine Falcons live anywhere except for North pole and South pole. They nest on rocky ledges and scrape loose sand together or gravel to make scrape.(scrape is like a small nest) The female usually lays 3-4 eggs at a time.
The bald eagle prefers tall trees near the top, while the golden eagle prefers cliffs, or rocky ledges in mountainous regions.