This video is called Caribou migration to the Arctic – BBC.
From the BBC:
Reindeer herds in global decline
Editor, Earth News
Reindeer and caribou numbers are plummeting around the world.
The first global review of their status has found that populations are declining almost everywhere they live, from Alaska and Canada, to Greenland, Scandinavia and Russia.
The iconic deer is vital to indigenous peoples around the circumpolar north.
Yet it is increasingly difficult for the deer to survive in a world warmed by climate change and altered by industrial development, say scientists.
Reindeer and caribou belong to the same species, Rangifer tarandus.
Caribou live in Canada, Alaska and Greenland; while reindeer live in Russia, Norway, Sweden and Finland.
Worldwide, seven sub-species are recognised. Each are genetically, morphologically and behaviourally a little different, though capable of interbreeding with one another. …
“From a Canadian perspective, the caribou is part of our national identity,” says Vors. “Canada’s caribou migrations have frequently been identified as one of this country’s natural wonders, and the species even appears on our 25-cent coin.”
British Columbia, Canada: DNA recovered from ancient caribou bones reveals a possible link between several small unique caribou herds and a massive volcanic eruption that blanketed much of the Alaskan Yukon territory in a thick layer of ash 1,000 years ago, reports research published today in Molecular Ecology: here.
A recent study on woodland caribou (Rangifer tarandus caribou) suggests that individual variations can literally be a matter of life and death–in this case not for the animals themselves, but for their offspring: here.
ScienceDaily (Apr. 1, 2010) — The hunter-gatherers who inhabited the southern coast of Scandinavia 4,000 years ago were lactose intolerant, according to a new study carried out by researchers at Uppsala University and Stockholm University: here.