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  • Ocean Through Time - Smithsonian Ocean
    Relatives of insects, crabs, and spiders, there were over 20,000 trilobite species that lived between the Cambrian and the end of the Paleozoic Era when they went extinct, some 252 million years ago Prolific survivors with a segmented body plan that could be easily modified and altered, they soon dominated the seafloor
  • Its Official: Three-Toed Sloths Are the Slowest Mammals on Earth
    To reach this conclusion, Pauli and his colleague M Zachariah Peery measured the metabolic rates of 10 three-toed sloths and 12 of the two-toed variety in Costa Rica and compared the results with
  • Mammals and their relatives thrived, diversified during so . . .
    This radiation’s strong connection to today’s mammals may explain how the myth arose that mammals remained static and primitive in the time of the dinosaurs, according to Grossnickle “But focusing on the Paleocene-Eocene radiation gives a distorted view of the history of mammals,” said Grossnickle
  • Why are we the only human species left on the planet?
    “If we take into account the last geologic age, which started 2 5 million years ago, there have always been different races and species of hominoids sharing the planet The big exception is the present day: never before has one human species existed alone on the earth ” Why are sapiens the last humans standing?
  • These unique animals have no close living relatives . . .
    There are 350,000 species of beetles—that’s an awful lot of relatives And yet some animals, like humans, have no fellow species in existence We’re all alone
  • Human taxonomy - Wikipedia
    There have been "taxonomic wars" over whether Neanderthals were a separate species since their discovery in the 1860s Pääbo (2014) frames this as a debate that is unresolvable in principle, "since there is no definition of species perfectly describing the case " [49] Louis Lartet (1869) proposed Homo sapiens fossilis based on the Cro-Magnon
  • 32 of the most dangerous animals on Earth - Live Science
    Mosquitoes belong to the family group Culicidae, and there are over 3,500 species worldwide However only a small number of these ( Anopheles , Aedea and Culex ) carry deadly diseases such as





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