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Seabirds can nest in trees (if any are available), on the ground (with or without nests), on cliffs, in burrows under the ground and in rocky crevices. Competition can be strong both within species and between species, with aggressive species such as sooty terns pushing less dominant species out of the most desirable nesting spaces. [ 55 ]
The area which a nest occupies grows throughout the breeding season as the breeding pairs throw their excrement outside the nest. [92] Over years, nests can reach 2 m (6 + 1 ⁄ 2 ft) in height. [98] Northern gannets lay one egg that on average weighs 104.5 g (3 + 5 ⁄ 8 oz), [99] which is light for such a large seabird. [100]
During peak birding season, there are often reports of the central meadow holding large numbers of sparrows, notably Le Conte’s, White-Crowned, Lincoln's and Fox. [6] In winter, the sanctuary is reported to have roosting owls, including Northern Saw-whet and snowy owl. [6] [7]
Bird migration is on the rise, and so are window collisions. As temperatures slowly drop in Chicago, 300 million to 400 million birds are crossing the continent heading south to their nesting ...
Seabirds fly low over water but gain altitude when crossing land, and the reverse pattern is seen in land birds. [ 34 ] [ 35 ] However most bird migration is in the range of 150 to 600 m (490–2,000 ft).
Nightjars are medium-sized nocturnal birds that usually nest on the ground. They have long wings, short legs, and very short bills. Most have small feet, of little use for walking, and long pointed wings. Their soft plumage is cryptically colored to resemble bark or leaves. Three species have been recorded in Illinois. Common nighthawk ...
As we saw all fall and a good portion of this winter season, if the weather is not real cold and the ground is not snow covered, the birds seem to manage fending for themselves out in the forest ...
Most species nest in crevices or burrows, and all but one species attend the breeding colonies nocturnally. Pairs form long-term, monogamous bonds and share incubation and chick-feeding duties. Like many species of seabirds, nesting is highly protracted, with incubation taking up to 50 days and fledging another 70 days after that.