Why do some animals migrate?

Animals migrate to reproduce, eat or look for warmer climate. Those who migrate long distances in groups from one part of the world to another, around the oceans, the plains or through the sky on the decision -making route. Some species must travel thousands of kilometers every year, while others do their way only once in their lives.

Warmer weather often means greater or better food source. Animals, as well as geese that spend spring and summer in the cold northern hemisphere, move south to winter according to seasonal schedule. They follow the same journey from year to year and often stop at the same monuments. Herbivorous mammals, such as African antelope, follow green grass depending on clotting and drought. Their annual travel patterns may not be along the same path, depending on the weather and feeding. Among these pilgrims, called "nomadic migration", include the behavior of massive plagues such as grasshoppers. Generally, however, animals travel closer to the warmer equator zone and far from the poleOh during the winter.

Another cycle that triggers migration is mating, pregnancy, birth and increasing young people. Some animals, like Pacific trout, make one long migration over the course of their lives. They travel from the small streams to open waters to grow up, and then return to the place of birth when they are ready to emerge. The ideal placement for animal reproduction can have a special food source, fewer predators or a geographical feature necessary for a new life. Turtles must have soft, sandy beaches to bury their leather eggs. Frogs need low, leaf branches to exceed ponds that are not in danger of drying too soon.

migration requires a huge amount of energy. Leading to a long journey Animals create fat for stored energy or for easier movement reduce weight. These changes trigger hormonal chemicals. In animals equipped for long distances navigation, afterSic sun and stars in the sky, water jets, temperature, wind conditions and their "biological clock" help them achieve a suitable goal.