Fear Alone Keeps Sparrow Numbers in Check (7 of 15) (IMAGE)
Caption
This shows song sparrow eggs: Zanette et al. report that just hearing the calls and sounds of predators frightened mother songbirds so much that they laid fewer eggs. Eggs were numbered in the order in which they were laid. This image relates to a paper that appeared in the Dec. 9, 2011, issue of Science, published by AAAS. The paper, by L.Y. Zanette at University of Western Ontario in London, ON, and colleagues was titled, “Perceived Predation Risk Reduces the Number of Offspring Songbirds Produce per Year.”
Credit
Image courtesy of Liana Zanette
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