Over two thousand reindeer plunge into the Yuribey river crossing from South to North. The migration over the river is only possible at certain points of the year as the water level rises with the summer melt. Migrating on the peninsula is becoming trickier for the herders as the climate gets warmer. In Yamal there are both private and state owned reindeer, some tribes herd their own animals, others herd deer owned by the government for salary. In summer the herds need to be larger to act as a natural defence against the hordes of mosquitoes. The herds on the Yamal Peninsula range from 50 in small private herds to 7,000 in the largest 8th Brigade herd on the Yar-Sale state farm.