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The new study is the first to show parasites can influence behavior in gray wolves.

A child sits on a monument dedicated to Christopher Columbus. The building commemorates the landing of this sailor in the coastal town of Aquadilla, Puerto Rico.

The Mont Blanc Massif, with western Europe's highest peak, is fundamentally changing due to climate change, along with mountains worldwide. Temperatures in mountainous regions have risen up to 50 percent faster than the global average,.

The tower in Rouen where Joan was imprisoned still stands.

Aspens will put up new shoots in response to stress, but if those shoots are eaten by grazers like deer or cattle, the young trees don't have a chance to mature.

A quaking aspen tree, Pando aspen, in Fishlake National Forest, Utah. The trees are part of a single organism, called a clonal body.

These quaking aspen trees, in Fishlake National Forest, Utah, form the biggest single organism on the planet. Grazing deer and cattle that munch on newly sprouted trees are threatening the forest's survival.

Bristlecone pines like this one in California are among the oldest living trees. Convinced their rings could reveal the earth’s climate history, dendrologist Edmund Schulman spent summers hunting them. In 1953, he found his patriarch in California’s White Mountains—Methusalah, a bristlecone with 4,676 rings, then, the world’s oldest. In 1964, Donald Currey, a graduate student, found bristlecones in Nevada that rivaled Shulman’s. In coring a specimen to determine its age, the drill bit broke. Currey convinced the Forest Service to cut the tree for study. Its rings numbered 4,844. The oldest tree discovered until that time had been inadvertently cut down. Methuselah still stands; its location remains a secret.

The search for the southernmost tree in the world led to Isla Hornos, the last scrap of land in the Tierra del Fuego. The expedition, led by Brian Buma, a forest ecologist at the University of Colorado, Denver, determined that the titleholder was Nothofagus betuloides, a 41-year-old Magellan’s beech just under two inches in diameter that stands two feet high. With a baseline established, scientists hope to monitor soil warmth and tree growth—and in an age of climate change—determine whether that southernmost edge will advance south toward Antarctica.