Sleeping ducks, I A recent report in the journal Nature
Chapter 5, Problem 5.30(choose chapter or problem)
Sleeping ducks, I A recent report in the journal Nature examined whether ducks keep an eye out for predators while they sleep. Th e researchers, from Indiana State University, put four ducks in each of four plastic boxes, which were arranged in a row. Ducks in the two end boxes slept with one eye open 31.8% of the time, compared with only 12.4% of the time for the ducks in the two center boxes
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