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This extraordinary fossil, discovered in Mongolia, preserves a recently hatched animal atop the eggs of what would have been its nest mates. The eggs are not paired, suggesting the egg-layer had only one egg tube—the modern bird condition. The tiny animal is a troodontid, which is a group of small, feathered, non-bird dinosaurs with large brains.

Details

  • Title: Byronosaurus nest
  • Creator: Photo: AMNH/M. Ellison

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