True imitation in marmosets

@article{Voelkl2000TrueII,
  title={True imitation in marmosets},
  author={Bernhard Voelkl and Ludwig Huber},
  journal={Animal Behaviour},
  year={2000},
  volume={60},
  pages={195-202}
}
Marmosets, Callithrix jacchus, observed a demonstrator removing the lids from a series of plastic canisters to obtain a mealworm. When subsequently allowed access to the canisters, marmosets that observed a demonstrator using its hands to remove the lids used only their hands. In contrast, marmosets that observed a demonstrator using its mouth also used their mouth to remove the lids. Since hand and mouth demonstrators brought about identical changes in the canisters, the differential test… 

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