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How Do You Give a Lemur a Vision Test?

In an enclosure at the Duke Lemur Center in Durham, North Carolina, animal trainer Meg Dye holds up two cards: a white card and a black one. Each time Grendel the aye-aye choses the white card over the black one by reaching out and touching it with his hand, he gets a treat. The researchers are trying to understand what aye-ayes can see at night, when they do most of their foraging. Read more:https://sites.duke.edu/dukeresearch/2...