Conservation of liquid and solid quantity by the chimpanzee.

@article{Woodruff1978ConservationOL,
  title={Conservation of liquid and solid quantity by the chimpanzee.},
  author={Guy Woodruff and David Premack and K Kennel},
  journal={Science},
  year={1978},
  volume={202 4371},
  pages={991-4}
}
Sarah, an adult "language"-trained chimpanzee, made accurate same-different judgments on quantities of liquid and solid matter and conserved both types of quantity despite a transformation in an irrelevant property (shape). Control tests showed that she judged on the basis of inference rather than perceptual evaluation of the quantities. She failed to make accurate same-different judgments on the basis of number, and she was not tested for conservation of this type of quantity. 

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