Assortative mating online dating data analysis

Other species have breeding systems that are polygynous (arrangement of one male with many females) or, rarely, polyandrous (arrangement of one female with many males).Birds produce offspring by laying eggs which are fertilised through sexual reproduction.Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.The fossil record indicates that birds evolved from earlier feathered dinosaurs within the theropod group, which are traditionally placed within the saurischian dinosaurs; their closest living relatives are the crocodilians.

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Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich.Avialae is also occasionally defined as an apomorphy-based clade (that is, one based on physical characteristics).Jacques Gauthier, who named Avialae in 1986, re-defined it in 2001 as all dinosaurs that possessed feathered wings used in flapping flight, and the birds that descended from them.Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites, penguins, and diverse endemic island species of birds.The digestive and respiratory systems of birds are also uniquely adapted for flight.

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