Add Yahoo as a preferred source to see more of our stories on Google. A male hourglass tree frog (Dendropsophus ebraccatus) with an inflated vocal sac used to produce calls. (Ryan Taylor) Your taste ...
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Smithsonian Magazine on MSN
Humans and animals often like the same mating calls, supporting a 150-year-old observation by Charles Darwin
Plants and animals have evolved all sorts of ways to make themselves more appealing to potential mates—including colorful ...
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