Birds migration Bird migration. What do you know about bird migration? Are you one of those who thinks that bird migrates because of changes in temperatures? Sorry, but you are wrong. In this article, we are going to tell you all the fact of bird migration. Firstly, there is the main fact that is the changes in temperature, but there are many species of birds which don't migrate. Besides, the main reason why birds migrate is to find the food they eat. Region's physical geography can be a problem for migrating birds. Mountains, for example, are no problem for birds of prey. However small songbirds need to fly hundreds of extra kilometers around the mountains because of don't have the same physical features. Moreover, some bird of the same species could be in different place, this is because the territory is occupied. Do you know that birds change direction as the position of the sun? Besides, this animal can recognize smells and landmarks. Naturally, these are not the only one's facts but if you want to know more about birds, you have to read the next article.