In the glaciers of the Swiss Alps, where snow blankets the mountain tops throughout much of the year, plant life has had to learn to adapt to the harsh environment in order to survive.
In winter snow falls and average temperatures remain below zero degrees celsius for weeks at a time. In weather like this UV rays are particularly strong and natural food sources are scarce. But somehow, even in these conditions, snow algae manage to thrive. To do this, these plants have evolved to change color from green to red. They have developed a means of storing reserves of energy which ensure their survival through even the harshest winters.