Exploration of the Moon invention of the telescope, an increasing number of people began to recognise the Moon as a sphere, though many believed that it was "perfectly smooth". In 1609, Galileo Galilei drew one of the first telescopic drawings of the Moon in his book and noted that it was not smooth but had mountains and craters. Later in the 17th century, Giovanni Battista Riccioli and Francesco Maria Grimaldi drew a map of the Moon and gave many craters the names they still have today. On maps, the dark parts of the Moon's surface were called "maria" (singular "mare") or seas, and the
Craters of the Moon National Monument and Preserve some birds also alter their times of activity. Some animals, like ground squirrels and marmots, have one or more periods of estivation, a summer hibernation that allows them to avoid the hottest and driest periods. Several animals are unique to Craters of the Moon and the surrounding area. Subspecies of Great Basin pocket mouse, American pika, yellow-pine chipmunk, and yellow-bellied marmot are found nowhere else. Lava tube beetles and many other cave animals are found only in the lava tubes of eastern Idaho. In May 1980 wildlife researcher Brad Griffith of the University of Idaho started a three-year study to