and a half 1000 kilometers to the east in the capital of the republic of sarka also known as yakutia killen is on his way to the institute for biological problems of the cryo litters and that's the region where permafrost prevails he's a biologist and studies wild reindeer whose numbers are declining. and the head of the institute in a club called is worried. i don't you have them sign me. in the cross ask region they used to be more than a 1000000 reindeer. but. that's not the latest count here there were just 3 or 400-0048 little kid. that's led us to pay special attention to the problem but if. we want to know what's happening to our reindeer populations. you can hear them i mean. the 2 biologists say climate change but also human interventions are behind the steep decline in numbers one growing problem is competition between wild reindeer and herd reindeer. killing is on an expedition on the menu river which cuts through one of the main routes of migrating wild reindeer. in order to find out more about their migration patterns he wants to attach transmitter collars to as many specimens