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Researchers in England investigated reasons why different species of birds begin to sing at different times of the morning.

Researchers in England investigated reasons why different species of birds begin to sing at different times of the morning. They captured and examined birds of 57 species at different sites around England. They reported that there was a strong relationship between the diameter of a bird's eye and the time it started singing in the morning: birds with larger eyes tended to start singing earlier. Is this anecdotal evidence, an experiment or an observational study?

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