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Notes and Reflections on Books and Media

by Hannah Leitheiser


The Voyage of the Beagle

Charles DARWIN



The history of connection or disconnection from other ecological communities can be inferred in the animals or plants of a region. Mountains of America's arid west, although separated from other forests by hundreds of miles, have squirrel populations, implying some past extensive forest. Many islands lack amphibians and mammals, implying that they have long been separated by salt water. The old and new worlds have many similar but distinct plants and animals. To my knowledge, no native species of squirrel are in common between Eurasia and America, although both areas have squirrels. With more modern genetic analysis, more can be inferred, but I'll save talking about that for a later time.