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Lava Gull, Larus fuliginosus specie is a large gull, related to the Laughing Gull. One of the rare gulls in the world, the entire population lives on the Galapagos Islands and is estimated at 400 couples. Gulls lava are solitary nest, throwing two of olive color and well camouflaged eggs, which take 30 days to incubate. Young birds to 60 days [...]

Female crocs lay their eggs in clutches of 20 to 60 eggs. After the eggs have incubated for about three months, the mother opens the nest and helps her young out of their shells.

The eggs are fertilized during the transfer from the female to the male. The males incubate the eggs and carry them to term, releasing miniature sea dragons into the water after about four to six weeks.

In Australia, a team of scientists led by Canberra University's Alex Quinn recently discovered that high temperatures could effectively "switch" the sex of central bearded dragons. Incubating the lizards' eggs at temperatures between 34°C and 37°C caused a majority of male embryos to hatch as females — an effect that has scientists worried about th

Listen to this article (info/dl)This audio file was created from a revision dated 2008-01-05, and may not reflect subsequent edits to the article. (Audio help)More spoken articles   Birds (class Aves) are bipedal, warm-blooded, vertebrate animals that lay eggs. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.7 m (9 ft) Ostrich.Modern birds are characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All birds have forelimbs modified as wings and most can fly, with some exceptions including ratites, penguins, and a number of diverse endemic island species. Birds also have unique digestive and respiratory systems that are highly adapted for flight.Many species undertake long distance annual migrations, and many more perform shorter irregular movements. Birds are social; they communicate using visual signals and through calls and songs, and participate in social behaviours including cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially monogamous, usually for one breeding season at a time, sometimes for years, but rarely for life. Other species have breeding systems that are polygynous ("many females") or, rarely, polyandrous ("many males"). Eggs are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.Many species are of economic importance, mostly as sources of food acquired through hunting or farming. Some species, particularly songbirds and parrots, are popular as pets. Other uses include the harvesting of guano (droppings) for use as a fertiliser. Birds figure prominently in all aspects of human culture from religion to poetry to popular music. About 120–130 species have become extinct as a result of human activity since the 17th century, and hundreds more before then. Currently about 1,200 species of birds are threatened with extinction by human activities, though efforts are underway to protect them.