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The United States is home to many unique travel destinations. From the stunning views at Grand Canyon National Park to the beaches of the Florida Keys, visitors can see all kinds of natural wonders. They can also experience human-made sights at popular places such as Walt Disney World and Washington, DC. All these destinations offer a variety of activities, landscapes, and learning opportunities. Essential Travel Guides explores several of these sites,...
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"Brothers John and Frank Craighead knew there was a problem when they saw fewer and fewer grizzly bears at Yellowstone National Park. But how did grizzlies-with a population size once as big as 100,000-wind up on the endangered species list? Follow along in this graphic adventure based on a true story of how the Craighead brothers learned all they could about these beautiful bears in order to save the silvertip. Then, learn more about grizzlies and...
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"In 1930, when wolves disappeared from Yellowstone Park, the ecosystem started to collapse. With no wolves, the elk population exploded, directly contributing to overgrazing of young trees and cottonwood plants. This, in turn, led to a decline in songbirds and beavers, the latter of whom rely on willows in winter. As beavers declined in numbers, the lack of damming and shade meant water temperatures rose, and certain cold-water fish could no longer...