We all know that there are some factors for species and animals to survive and reproduce, including environmental conditions, temperature, tolerance range, body size, weight, diets, seasonal variation and daily activity, behavior, and the altitude they live. Animals migrate to find a new habitat because the change of environment and only species that have the tolerance for the new environment could survive and reproduce. Human beings are the only organism that makes extensive use of technology to extend the limits of its natural tolerance range. Some species even migrate to find suitable habitats for different climate and season. Climate and seasons are vital factors for animal survival.