Mountains support a variety of animal life. The number and kinds of animals found on mountains varies with the altitude. More animals live at lower altitudes than at higher ones, largely because of the difference in climate between elevations. Generally, lower altitudes are warmer, drier, and less windy than higher altitudes. In addition, more plants live at lower elevations and therefore more food is available for animals, bears. And Mink make their homes in the forested lower slopes and in the wooded, grassy valleys of mountains, rainbow trout and Grayling swim in mountain streams. Many mountains have meadows of grasses and herbs. These meadows are home to Chinchillas. Ibexes law. Vicunas and yats butterflies, grasshoppers. And spiders also live there. Above the timberline, that is the line beyond which trees will not grow because of the climate stand, rocky cliffs and peaks dotted with shrubs, mosses and other plants. Sure footed bighorn sheep and mountain goats well among the windswept rocks, as do furry marmots and pikas. High on the snow capped peaks only a few insects, spiders and ice worms can survive. Golden Eagles and some other birds fly.