Anybody know what a vole is?
Basically, it's a little rodent that likes to burrow. But up here where the snow is usually 10 feet deep, they make tunnels between the ground and the snowpack, packing mud up into the snow. When the snow melts, you end up with little above ground tunnels .... everywhere.
Voles can have 5-10 littes a year with 5-10 young per litter. You do the math. You couldn't walk without stepping on vole tunnels up there.
End of the trail. It was a great birthday!