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Caribou
Fall. In the fall the caribou starts their long walk back to the boral forest, the herd traditionally cross the Porcupine River sometime in September. In this time of the year the bulls fight each other to decided who get which female. The bulls fight violently enough to injure, or even kill, individual bulls. Now the Job is done and the caribou can rest until next year.
Source http://www.asij.ac.jp/elementary/projects/3-s/webgame/benp/title.htmposter yourself http://www.environmentyukon.gov.yk.ca/wildlifebiodiversity/mammals/caribou.php.http://www.thewildclassroom.com/biomes/arctictundra.html http://www.flickr.com/photos/38631601@N04/4423368050/
Spring In this season the caribou have their calves and they start migrating. The northward migration begins some time in April. The caribou's migrate from their winter range to traditional calving grounds. Most cows give birth to a single calf in early June. Newborn calves are able to stand and walk within hours of birth, and soon after can follow their mothers across the tundra. Their first taste of life may be their last: Almost half of all the newborn calves die during their first year. Predation by wolves, grizzly bears, and golden eagles is the cause of most deaths.
Winter From November to March, they move slowly through the Boreal forest. Through the darkest and coldest part of the year, the caribou search through the snow cover in hope of finding lichens or green vegetation.. The temperature in the tundra is -50 degrees Celsius has little effect on their activity. After the caribou has been feed by trees it moves out to an open space to rest usually on frozen lakes, meadows or hilltops where visibility is good. Moving into the open space is a strategy against the wolves because their only defense in running away, the caribou has to know when the predator comes and then they have to get a head start.
The artic Tundra. The artic tundra is located in the northern hemisphere. the average temperature. in the artic tundra is -34 Celsius. Their are only two seasons in the tundra the summer and winter. The sun is only present 24 hours a day. The sun only warms up the tundra enough to make the temperature rise to 3-12 Celsius. In the winter is is opposite for some weeks the sun never comes up. Precipitation levels in the tundra are from 6 to 10 inches a year.
The Caribou's Adaptation
Caribou's are adapted to suit their enviroment whit thease adaptation One of the caribou adaptation is that they have small ears and a small tail to prevent any body temperature loss. They have very strong legs so they can run very fast and walk long distances. They also have gray hair in the winter and they have brown hair in the summer for camouflage. They have great legs for paddling and their body flotes like a life vest.
Summer. After calving the caribou have to face the mosquitoes and flies that have recently decided to annoy every living thing in the Yukon. The mosquitoes and flies can drive a caribou mad. Usually some groups of caribou travel in packs of 70,000 or 80,000, as they search to find a cool and peaceful place. In the summer the caribou are always on the move, either to get away from the mosquitoes and flies or to find good and healthy food so they can prepare for the winter.
The caribou's migration. The caribou migrate over 250,000 square kilometers every year. The Caribou migration is from northeastern Alaska across the northern Yukon to the Mackenzie Delta in the Northwest Territories.
The Caribou's enviroment
This is a picture of caribou's migrating. More fact at the bottom.
This is a picture of lichens which is the food that the caribou eats in the winter.
