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  2. Origin of birds - Wikipedia

    en.wikipedia.org/wiki/Origin_of_birds

    A close relationship between birds and dinosaurs was first proposed in the nineteenth century after the discovery of the primitive bird Archaeopteryx in Germany. Birds and extinct non-avian dinosaurs share many unique skeletal traits. [1] Moreover, fossils of more than thirty species of non-avian dinosaur with preserved feathers have been ...

  3. Timeline of the evolutionary history of life - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the...

    Diversity in stegosaurian and theropod dinosaurs. 131 Ma First pine trees. 140 Ma Orb-weaver spiders appear. 135 Ma Rise of the angiosperms. Some of these flowering plants bear structures that attract insects and other animals to spread pollen; other angiosperms are pollinated by wind or water. This innovation causes a major burst of animal ...

  4. Evolution of birds - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_birds

    The evolution of birds began in the Jurassic Period, with the earliest birds derived from a clade of theropod dinosaurs named Paraves. [1] Birds are categorized as a biological class , Aves. For more than a century, the small theropod dinosaur Archaeopteryx lithographica from the Late Jurassic period was considered to have been the earliest bird.

  5. Where did dinosaurs first evolve? Scientists have an answer

    www.aol.com/news/where-did-dinosaurs-first...

    An enigmatic bipedal creature called Nyasasaurus from Tanzania, known from fragmentary fossils perhaps dating to 240–245 million years ago, represents what the earliest dinosaurs may have looked ...

  6. Cretaceous–Paleogene extinction event - Wikipedia

    en.wikipedia.org/wiki/Cretaceous–Paleogene...

    Several analyses of bird fossils show divergence of species prior to the K–Pg boundary, and that duck, chicken, and ratite bird relatives coexisted with non-avian dinosaurs. [142] Large collections of bird fossils representing a range of different species provide definitive evidence for the persistence of archaic birds to within 300,000 years ...

  7. Dinosaur - Wikipedia

    en.wikipedia.org/wiki/Dinosaur

    While the dinosaurs' modern-day surviving avian lineage (birds) are generally small due to the constraints of flight, many prehistoric dinosaurs (non-avian and avian) were large-bodied—the largest sauropod dinosaurs are estimated to have reached lengths of 39.7 meters (130 feet) and heights of 18 m (59 ft) and were the largest land animals of ...

  8. Phanerozoic - Wikipedia

    en.wikipedia.org/wiki/Phanerozoic

    The Paleozoic features the evolution of the three most prominent animal phyla, arthropods, molluscs and chordates, the last of which includes fish, amphibians and the fully terrestrial amniotes (synapsids and sauropsids). The Mesozoic features the evolution of crocodilians, turtles, dinosaurs (including birds), lepidosaurs (lizards and snakes ...

  9. Mesozoic - Wikipedia

    en.wikipedia.org/wiki/Mesozoic

    The Mesozoic Era [3] is the era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods.It is characterized by the dominance of archosaurian reptiles such as the dinosaurs, and of gymnosperms such as cycads, ginkgoaceae and araucarian conifers; a hot greenhouse climate; and the tectonic break-up of Pangaea.