Palaeontology: An Early Cretaceous pellet

@article{Sanz2001PalaeontologyAE,
  title={Palaeontology: An Early Cretaceous pellet},
  author={Jos{\'e} Luis Sanz and Luis Mar{\'i}a Chiappe and Yolanda Fern{\'a}dez-Jalvo and Francisco Ortega and Bego{\~n}a S{\'a}nchez-Chill{\'o}n and Francisco Jos{\'e} Poyato-Ariza and Bernardino P. P{\'e}rez-Moreno},
  journal={Nature},
  year={2001},
  volume={409},
  pages={998-1000}
}
We have discovered a mass of fossil bones from four juvenile birds at Las Hoyas in Cuenca, Spain, which show signs of having been digested. To our knowledge, this rare finding of an Early Cretaceous fossil of an apparently regurgitated pellet provides the first evidence that Mesozoic birds were prey animals. 

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