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Dimwitted Mammals Needed Muscle More Than Brains After Dinosaurs Died

It may have been the smart evolutionary strategy during a chaotic chapter of Earth’s history, but it didn’t last.

United statesNew mexicoStephen brusatteXiaoming wangOrnella bertrandSarah shelleyNatural history museum of los angelesUniversity of edinburghPaleocene epochNatural history museumLos angeles countyEocene epochAnimal cognitionAnimal intelligenceAnimal behaviorScience journal

After killer asteroid, mammals got bigger before they got smarter

By Will Dunham WASHINGTON (Reuters) - In the aftermath of the asteroid impact 66 million years ago that doomed the dinosaurs, it appears that brawn wa.

United statesNew mexicoRosalba obrienOrnella bertrandSteve brusatteUniversity of edinburghPaleocene epochEocene epochWill dunhamRosalbao brien

Fossil Friday: one of the oldest softshell turtle fossils shows these animals likely emerged in Asia

The fossil was discovered in 1975 in North Dakota alongside a Triceratops.

United statesNorth dakotaSteven jasinskiPeter dodsonSusan walkerStevene jasinskiUpenn arts sciencesEnvironmental sciencesDepartment of earthSchool of veterinary medicineCretaceous researchUniversity of pennsylvania department earthAppalachian state universitySchool of arts sciencesWalker research grantPenn department of earth

This softshell turtle hung out with T rex and triceratops

A newly discovered fossil belongs to a softshell turtle that lived alongside Tyrannosaurus rex and triceratops in North Dakota 66.5 million years ago.

United statesNorth dakotaAndrew heckertFrankk mckinneySteven jasinskiPeter dodsonSusan walkerJohne callahanAppalachian state universityTennessee state universityMexico museum of natural historySchool of veterinary medicine at pennCretaceous researchCretaceous periodLate cretaceousEocene epoch

A new saber-toothed mammal was among the first hypercarnivores

A 42-million-year-old jawbone with slicing teeth and a gap to fit saberlike teeth is pegged to a new species of the mysterious Machaeroidine group.

San diegoUnited statesSan diego countyAshley poustSan diego natural history museumSan diego natural historyPaleontologist ashley poustEocene epoch

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