kirilin is on an expedition on the e olenyok rivever, which s througugh one of thehe main ros ofeir mimiationnr order t to nd out more abou llars, tas many ecimensas he . tohe conditions he in the devices yatia.n n adted they arere waterproof f and can wiwithstand tempmperatures of s fofoy to minusus fifty degrees celsius. >> the t team have to o be pat. they are watching ouout foany reindeerer swimming acacross e river. when t they spot onene, they e to act f fast. this young male probablyeieighs -- this younung male probabably weigighs more thanan 130 kilog. thisisrocedure can be ngererou for the men and d is probablya bibiof a shock for the reindeer. ththe transmitter r is designeo fallll off once ththe batterys empty. ththey take the e animal's port r r the dabasese andet himim g they have atattached such h des to more thanan forty wildd reindeer so far. the data he e alreadrevevealed thth migration patterns areh des to morechanngng.orty wildd the reindeer head north to oloin the season every year.er and in t the winter they headddy to morechanngng.orty wildd rests to find enough to eat a