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  • Chapter 9: Population Distribution and Abundance - Quizlet
    a ) A species with short dispersal distances b ) A species that is competing for limited water or nutrients c ) A species whose habitat is patchily distributed d ) A species in which individuals are positioned at locations selected at random, Which of the following would most likely lead to a clumped dispersion pattern among some birds?
  • Archaeopteryx - University of California Museum of Paleontology
    Unlike all living birds, Archaeopteryx had a full set of teeth, a rather flat sternum ("breastbone"), a long, bony tail, gastralia ("belly ribs"), and three claws on the wing which could have still been used to grasp prey (or maybe trees) However, its feathers, wings, furcula ("wishbone") and reduced fingers are all characteristics of modern
  • Origin of avian flight - Wikipedia
    In order for birds to balance these forces, certain physical characteristics are required Asymmetrical wing feathers, found on all flying birds with the exception of hummingbirds, help in the production of thrust and lift Anything that moves through the air produces drag due to friction The aerodynamic body of a bird can reduce drag, but
  • Aves—A Taxonomy in Flux: Timeline
    Mesozoic Birds Avialae Gauthier, 1986 The birds originated from the Maniraptora branch of Theropod dinosaurs Avialae is defined as all theropods closer to modern birds than to Deinonychus Thus the Deinonychosauria (raptor dinosaurs: dromaeosaurids and troodontids) are not part of Avialae
  • DNA evidence is rearranging the branches of the avian family tree
    In fact, some ratite species are more closely related to certain flying birds, the quail-like South American tinamous for example, than they are to other ratites, says Michael Braun, a research scientist in the Department of Vertebrate Zoology at the Smithsonian’s National Museum of Natural History
  • 10 Steps of Animal Evolution, From Fish to Primates - ThoughtCo
    Vertebrate animals have come a long way since their tiny, translucent ancestors swam the world's seas over 500 million years ago The following is a roughly chronological survey of the major vertebrate animal groups, ranging from fish to amphibians to mammals, with some notable extinct reptile lineages (including archosaurs, dinosaurs, and pterosaurs) in between
  • Why Did Dinosaurs Have Feathers? - ThoughtCo
    The Majority of Feathered Dinosaurs Were Theropods Before we start, though, it's important to recognize that not all dinosaurs had feathers The vast majority of feathered dinosaurs were theropods, a broad category that includes raptors, tyrannosaurs, ornithomimids and "dino-birds," as well as the earliest dinosaurs like Eoraptor and Herrerasaurus





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