There are about 5,000 known mammalian species alive at present. Given the average species lifespan for mammals, the background extinction rate for this group would be approximately one species ...
resulting in an almost 16-fold increase in background noise intensity in places like the waters off the coast of California, an area rich with marine mammal migration. Scientists suspect that ...
21don MSN
Lyell shrew, a mouse-like mammal that lives in the central Sierra Nevada ... they're always running around," Subramanyan told CBS News. The trio set up a white background on the bottom of the box that ...
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