Most animals migrate to avoid bad weather, to find food, or to reproduce. Some animals migrate short distances, and some animals will migrate thousands of miles. Some animals will migrate for other reasons or will have to migrate differently due to things such as to escape things like:
- Hunting pressure
- Natural disasters (forest fires)
- Construction of roads/ houses/ buildings
True migrators make a two way round trip each year from one place to another and back again like animals such as elk, deer, ducks, geese, etc.
-Elk migrate around October/November when it starts to snow.
-Elk will stay towards the top of the mountains where it is more cooled down during the late spring and summer.
-When it starts to snow, and get cold up in the mountains where the elk are, the elk will start migrating down to lower elevations in search of food, less snow so that they can walk faster, and find more open plants, and grasses to eat.
-They also will migrate in search of open, unfrozen water that they can drink out of.
Elk will tend to migrate in bigger groups
-Duck's will start to migrate south when it starts to get cold up in Canada, and all of there water sources are freezing up, and all of their food sources are getting covered up with snow.
-Some ducks will migrate more based off of a calendar like teal, and gadwall. They tend to migrate around October each year.
-Ducks will migrate twice a year. There is a fall migration where they will migrate south from Canada, and they again in the spring where they will migrate from the south, back up to Canada to get up where it is slightly cooler, so that they can nest and raise their ducklings.
Ducks and geese will migrate down in "V" shaped patterns so that the goose/duck that is in front of the other one is blocking the wind for the goose behind the other. Ducks and geese will typically migrate in larger groups.
-The migration of nearly two million wildebeest, zebra, and antelope across the plains of Tanzania's Serengeti and Kenya's maasi mara is one of the oldest and last great land migrations on the planet.The movements of are dedicated solely by the rains and food sources (grasses), with zebras eating the long grasses, while wildebeest follow to feast on fresh shoots. While often unpredictable and not a perfect science.
-One of the main reasons that fish will migrate is to go to their spawning area for the purposes of reproduction.
-Generally fish begin their migration together, congregating in a group that grows until the impetus to begin their migration.
-So many fish enter the mouth of the rivers together over a short period of time. This is called a starting it's "run." Before the migration the fish have lived in smaller schools dispersed around their feeding areas.
-Different species of fish run at different times of the year. Salmon are a perfect example of this migration.
Other migrations (worms)
Even animals like worms will migrate to find food sources and escape the cold weather. Worms will migrate up and down.
"Earthworms, in the fall, migrate deeper into the earth, below the frostline. Sometimes they ball up to reduce moisture loss—as many as a hundred worms being bunched together—and thus spend the winter in inactivity.
"When spring comes and frost leaves the soil, the earthworms become migrants again, tunneling upward. They appear at the surface, leaving the first castings of the new seasons, as soon as the average temperatures of the ground reaches about 36 degrees.
Worm's will huddle together when migrating
There are many patterns in the animal migrations as I am learning this for math. A good example of this are swans. Swans will Stage up In Alaska during the spring/summer, and then most of them will migrate to the Great Salt lake in Utah, and hang out around the bays around the Great salt lake.
Swans migrating in Utah at bear river refuge