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The question of whether relatives of living birds co-existed with non-bird dinosaurs has evoked controversy. Some investigators, using “molecular clock” models and DNA sequence data as well as the distribution of living birds, have concluded that relatives of living birds must have existed alongside non-avian dinosaurs and survived the mass extinction of dinosaurs at the K/T boundary. This explosive, punctuated model, following a major extinction event, reflects the standard pattern of vertebrate evolution, especially documented following the Permian extinctions. Yellow areas indicate the subclass Ornithurae; blue areas indicate the subclass Sauriurae (From: Feduccia 2003). Birds of tropical rainforest: comparative biogeography and ecology. 215-228 in Biogeography and ecology of forest bird communities (A. Fossil Evidence for the Extant Avian Radiation in the Cretaceous -- Clarke et al. Geometric constraints explain much of the species richness pattern in African birds.

“We have more data than ever to propose at least the beginnings of the radiation of all living birds in the Cretaceous,” Clarke says. The effect of energy and seasonality on avian species richness and community composition. Information from a new species called Vegavis iaai indicates that these birds lived in the Cretaceous and must have survived the Cretaceous/Tertiary (K/T) mass extinction event that included the disappearance of all other dinosaurs. Species richness, hotspots, and the scale dependence of range maps in ecology and conservation. Analysis of the fossil, discovered in Antarctica in 1992, revealed a new species in the group Anseriformes, which includes ducks and geese. Proceedings of the National Academy of Sciences 104: 13384-13389. These taxa are extinct today, but by the close of the Cretaceous, representatives of several modern bird taxa were sharing the skies with these extinct birds. A birdwatcher 65 million years ago could have seen relatives of today's loons, geese and ducks, albatrosses and petrels, and gulls and shorebirds, and possibly other familiar birds as well.

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