Biogeography

Biogeography is the study of the geographical distribution of plants and animals.

Two world maps shaded in green for 10% and 30% forest area.

Defining How Much of the World is Covered by Forests

Caitlin Dempsey

With no universal definition, mapping and comparing forest coverage around the world is challenging.

A chestnut-backed chickadee on a redwood branch.

Number of “Dees” in a Chickadee’s Alarm Call is Related to the Danger Level of Nearby Predators

Caitlin Dempsey

The number of "dees" in a chickadee's alarm call correlates with the size and threat level of the predator.

A giant sequoia tree at Yosemite National Park's Mariposa Grove of Big Trees.

Geography of Giant Sequoias

Elizabeth Borneman

Giant sequoias are one of the longest lived tree species, with the oldest giant sequoia living an estimated 3,400 years.

A lizard clinging upright on a steep rock with dried grass behind it.

Urbanization is Shortening the Legs of Western Fence Lizards

Caitlin Dempsey

Western fence lizards have adapted to manmade surfaces in urban areas by developing shorter limbs and toes.

An American robin on a tree branch.

Most Abundant Landbird in the United States and Canada

Caitlin Dempsey

The American robin has the largest population among all landbirds in the United States and Canada.

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