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How can cicadas survive--and thrive--at temperatures pushing 115 F? Do hummingbirds know what they're up against before they migrate over the Gulf of Mexico? Why do some trees stop growing taller even when three months of warm weather remain? With awe and unmatched expertise, Bernd Heinrich's Summer World never stops exploring the beautifully complex interactions of animals and plants with nature, giving extraordinary depth to the relationships between habitat and the warming of the earth.