Calliope Hummingbird Identification and Size Measuring a mere 3 inches long and weighing one-tenth of an ounce, roughly the ...

For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

VATICAN CITY (AP) — Key events in the life of Jorge Mario Bergoglio, who became Pope Francis and died on Monday: Dec. 17, ...