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Hansson L., 1986: Vole snow trails and tunnels as density indicators. Acta theriol., 31, 29: 401—408 [With 1 Table & 2 Figs.] The formation of trails on the snow surface and the digging of tunnels up to the snow surface by field voles Microtus agrestis was studied in order to establish their usefulness as indicators of density. The number of tunnels showed a negative correlation to the time since the start of winter, i.e., it was related to winter survival. However, this number was higher than the number of animals when snow thickness was below 30 cm and lower when it was above 30 cm. The animals chose the energetically cheapest ways of constructing tunnels, many tunnels being located at human foot prints in the snow. The number of tunnels remained fairly constant for up to four days after snow-fall. Appropriate conditions for using tunnels as density indicators were thus restricted, and were even more limited as regards trails on the snow.