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  1. Paleontology

    Healed scars tag T. rex as predator

    Healed wounds on the fossil skull of a Triceratops—wounds that match the size and shape of those that would be made by Tyrannosaurus rex—are a strong sign that the tooth scrapes are a result of attempted predation, not scavenging.

    By Sid Perkins
  2. Paleontology

    Role of gastroliths in digestion questioned

    New analyses of the gastroliths in ostriches are casting doubt on the theory that large, plant-eating dinosaurs swallowed stones to grind up tough vegetation and thereby aid their digestion.

    By Sid Perkins
  3. Paleontology

    Tracks suggest chase, capture, and after-meal respite

    A 1.3-meter-long, S-shaped trail of fossil footprints discovered in southwestern Indiana includes one set of disappearing tracks—suggesting an ancient chase—and an impression where the predator rested after its meal.