All four tortoises l

All four tortoises learned how to use the touchscreens during the training phase before the experiment started. But only two of them – Esme and Quinn – actually figured out how to use them to get their snacks. Mueller-Paula doesn't know why Molly and Emily didn't manage to solve the puzzle, especially since "up to this stage they had performed reliably and with levels of success comparable to those of Esme and Quinn." The study says something interesting about the spatial abilities of reptiles, but more importantly it reveals the usefulness of touchscreen technology for probing the animal mind.

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