Altitudinal migration is a short-distance animal migration from lower altitudes to higher altitudes and back.[1][2] It is commonly thought to happen in response to climate and food availability changes as well as increasingly due to anthropogenic influence.[3][4] These migrations can occur both during reproductive and non-reproductive seasons.[5] Altitudinal avian migration is common, and can also be found in other vertebrates, and can be seen in some invertebrates.[3][6]