Bugs on the Snow - Bob Armstrong's Nature Alaska

http://vimeo.com/115734192

During winter in Juneau I often notice a variety of insects on the snow.
This seems to happen mostly when the temperature rises above 32 degrees for a short period.
Why would an insect run about on the snow during winter?
It could be for mating -- easier to find a mate with fewer species flying about -- less birds about to eat them.
Some look for prey to eat.
Springtails use the fairly flat snow to move from one habitat to another -- they apparently orientate on the sun or dark horizon to go in a constant direction.
It is fun to lay down on the snow and watch the tiny insects moving about and to think about why.