Deinonychus

Deinonychus  ( /daɪˈnɒnɨkəs/   dy- non  -i-kəs ;   Greek:   δεινός , 'terrible' and <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  ὄνυξ<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, genitive <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  ὄνυχος<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">'claw') is a <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  genus<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">of <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  carnivorous<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  dromaeosaurid<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  ceolurosaurian<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  dinosaurs<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">. There is one described species, <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Deinonychus antirrhopus<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">. This species, which could grow up to 3.4 metres (11 ft) long, lived during the early <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Cretaceous<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Period<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, about 115–108  million years ago<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">(from the mid- Aptian<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">to early <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Albian<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  stages<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">). Fossils have been recovered from the <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  U.S. states<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">of <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Montana<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Wyoming<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, and <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Oklahoma<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, in rocks of the <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Cloverly Formation<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">and <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Antlers Formation<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">, though teeth that may belong to <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Deinonychus<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">have been found much farther east in <span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">  Maryland<span style="color:rgb(37,37,37);font-family:sans-serif;line-height:22.399999618530273px;">.

<p style="margin-top:0.5em;margin-bottom:0.5em;line-height:22.399999618530273px;color:rgb(37,37,37);font-family:sans-serif;">Paleontologist John Ostrom's study of Deinonychus in the late 1960s revolutionized the way scientists thought about dinosaurs, leading to the "dinosaur renaissance" and igniting the debate on whether dinosaurs were warm-blooded or cold blooded. Before this, the popular conception of dinosaurs had been one of plodding, reptilian giants. Ostrom noted the small body, sleek, horizontal posture, ratite-like spine, and especially the enlarged raptorial claws on the feet, which suggested an active, agile predator.<sup class="reference" id="cite_ref-ostrom1970_1-0" style="line-height:1;unicode-bidi:-webkit-isolate;">[1]

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