Behavior
Singing voles are at least semi-colonial animals, sharing burrows between family groups. They are active throughout the day, with no clear preference for sunlight or night time. They make runways through the surface growth, connecting feeding grounds to burrow entrances, although these are not as clear as those made by some other vole species. They also sometimes forage in low bushes.
The burrows consist of a number of chambers, many of them used to store food for the winter, connected by very narrow passages. These passages, typically around 2.5 centimetres (0.98 in) wide, make it difficult for any animal larger than a vole to pass through, and thus help protect against predators such as weasels. The burrows run horizontally, no more than 20 centimetres (7.9 in) below ground level, and can extend for as far as 1 metre (3.3 ft) from the tunnel entrance.
Unusually among voles, in addition to storing food, such as roots and rhizomes, underground, singing voles also often leave stacks of grasses out on rocks to dry. Often, these stacks are instead constructed on low-lying branches, or on exposed tree roots, helping to keep them dry. The stacks of grasses slowly dry out, producing hay, and may include other food materials, such as horsetails or lupines. The voles begin to construct the stacks around August, and by the winter, they may have reached considerable size, with piles of up to 50 centimetres (20 in) in height having been reported. The piles are a source of nutritious food through the winter, although they are liable to be raided by other animals.
This species gets its common name from its warning call, a high-pitched trill, usually given from the entrance of its burrow.
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