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Author | Title | Year | Publication | Serial | Volume | Pages |
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Meehan, C.L.; Mench, J.A. | The challenge of challenge: Can problem solving opportunities enhance animal welfare? | 2007 | Applied Animal Behaviour Science | 2890 | 102 | 246-261 |
McCoy, D.E.; Schiestl, M.; Neilands, P.; Hassall, R.; Gray, R.D.; Taylor, A.H. | New Caledonian Crows Behave Optimistically after Using Tools | 2019 | Current Biology | 6581 |