We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. By continuing to use our site, you accept our use of Cookies, Privacy Policy Term of use.
Video Player is loading.
Current Time 0:00
Duration 0:00
Loaded: 0%
Stream Type LIVE
Remaining Time 0:00
 
1x
25 views • September 19, 2016

What Is Migration? (In Animals)

Natural World Facts
Welcome to another episode of Natural World Facts! This fact file is all about Animal Migrations. Migration is nearly universal within the animal kingdom; Animals across the globe, from birds and mammals to reptiles and insects, migrate for a whole variety of different reasons. So why do animals migrate? Well, resources on Earth fluctuate and change constantly. Warm summer months may be followed by inhospitable cold. Plants may be in abundance in one place, but only for a short time. The best place to find food may not be a good place to give birth or hatch young. All these changing factors lead to animals needing to move to a better suited environment at different times of the year. The motivations behind migrations are simple. Food, breeding and climate. For humpback whales, the best place to feed isn't the best place to reproduce. During warmer months, these whales feed in nutrient-rich waters where prey is abundant. However, they mate and give birth in warm waters that contain little food. These whales will journey as far as 5,000 miles (8,047 km) to their suitable breeding grounds, meaning they will go without eating throughout the winter. For the Pacific salmon, migration is a vital part of its life. After spending their adult lives in the ocean, these fish journey up against the current of freshwater rivers where they were born to hatch the next generation. Once they have spawned their young, they die. It's a difficult and dangerous task just to reproduce, and only one in a thousand salmon will live to return to the stream where it was hatched. This migration is a vital part of this species life cycle, enabling it to spawn offspring and continue its life cycle. But how do all these animals know where to go? Migrant animals can use the sun and stars, the Earth's magnetic field and their sense of smell to find their way. Some migratory birds navigate using landmarks such as coastlines, mountains or even man-made structures such as motorways! Bird migration is usually a seasonal movement between breeding and wintering grounds. They migrate to move from areas of low or decreasing resources to areas of high or increasing resources, including food and suitable nesting locations. No-where in the world is there a movement of animals as huge as the wildebeest migration. Over two million animals migrate from the Serengeti National Park in Tanzania to the greener grazing areas of the Maasai Mara National Reserve in Kenya from July to October. The migration can be very dangerous, the wildebeest have to cross the Mara River where crocodiles will prey on them. It shows what risks some animals will take to feed and rear their young. Overall, migrations are usually in response to the changing demands of an animal, wether it be food, breeding grounds or a changing climate. Animals can manage to adapt to certain migrations over generations, and can follow them each year using guides such as the sun, landmarks, and natural instincts. Natural World Facts is a channel dedicated to bringing you fascinating facts about our natural world, and the wonderful animals that we share it with. Subscribe for more videos! Leave a suggestion in the comments for what animal you would like to learn about next. OUR WEBSITE: http://goo.gl/Ngj5V6 TWITTER: http://goo.gl/U4T8JX
Show All
Comment 0