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In the early 1900s, UC Berkeley's Joseph Grinnell surveyed bird territories in California's Sierra Nevada. Biologists have now found that out of 53 bird species, 48 have moved. Why? Climate change, they say. Many of the birds' new ranges are farther north or higher in altitude, with temperatures or rainfall akin to where they lived before.
Learn more about the western tanager at the Encyclopedia of Life.
The spectacular sights of the cosmos are now as easy to see as the stars above, with the 18 lavishly illustrated lectures of A Visual Guide to the Universe, produced in partnership with the Smithsonian. Orbit Saturn, search for water and life on Mars, and witness an armada of space telescopes uncovering the secrets of the cosmos.
The Meaning of Human Existence [Edward O. Wilson] on Amazon.com. *FREE* shipping on qualifying offers. National Book Award Finalist. How did humanity originate and why does a species like ours exist on this planet? Do we have a special place