Paul Andersen explains how organisms respond to the external environment. He begins with a discussion of behavioral responses like hibernation and migration. He ends with a discussion of physiological responses like shivering and...

Last in a series of videos on human prehistory, this video describes how human populations from different geographical regions have reunited in the modern era. [2:45]

The video lesson from Khan Academy provides information for a high school world history course. This section assesses students' knowledge of the causes and effects of human migration.

A video discussing the migration of Wyoming's pronghorn antelope. Students will learn about the animals that use the migration corridor that stretches from the Grand Tetons in Northwest Wyoming to the Red Desert in South Central Wyoming....

NPR's Morning Edition chronicles the plight of Latino migrants who attempt to cross the border into the United States.

What drives monarch butterflies to undertake a mass migration, traveling thousands of miles to pine groves in Mexico? New research takes a look at a complex circadian clock mechanism in the butterfly brain, a molecular tool that allows...

Geese head south for the winter, and the swallows return to Capistrano - but how? In this hour, we'll talk about how birds make their migratory journeys, and how scientists are trying to study their travels.

This lesson will introduce immigration and emmigration, and explain the effects both can have on a community. It is 3 of 3 in the series titled "Immigration and Emigration."

This lesson will explain the determinants of population growth. It is 2 of 4 in the series titled "Population Growth."

This lesson will explain the determinants of population growth. It is 3 of 4 in the series titled "Population Growth."

This downloadable song by Sara Jordan tells how different animals survive during the long cold winters. After listening to the four choices in this song, which do you think humans do?