Therefore, the snails of Finse stay mainly on the south- and west-facing slopes in the calcium-rich phyllite bedrock, where willow and vigorous tall perennials tend to grow. Nordrenut is such a place, and because of this it is a known research locality. All of the snail species of Finse can be found at Norenut.
A snail generation in the mountains is likely to take longer to complete than in the lowlands. The species Vitrina pellucida (small picture to right) has a one-yearly life-cycle in the lowlands, that is, that all phases from egg to larva to full-grown individual, are completed in one year. In the high mountains, this cycle is two-yearly, possibly three-yearly some places or in unfavourable years with low temperatures. This is an adaptation to a short growth season and sparse living conditions otherwise, a common strategy among the invertebrates of the high mountains.
