Let's welcome the newest addition to the Endless Summer® Collection:
Bella Anna™ Hydrangea


Now curious about this extensive network of tunnels beneath the snow, I headed straight for the Internet. My initial Google search revealed a “Northern Mole Vole”, but it lives on a different continent (Northern Afghanistan, Ukraine, Mongolia, China) and is not my culprit. The highlights of my investigation follow:
The name of the region where snow cover meets soil is the subnivean zone. Insulated by a thick, snowy, thermal blanket, a variety of creatures take advantage of the snowy cover from predators to tunnel and breed freely during the winter. When the snow begins to melt this spring, watch for their mini mazes of inter-connecting trails, runways, tunnels and occasional nest of grasses.
Adult Moles moles measure 5 to 8 inches long which is too large for these little tunnels. In addition to living and tunneling in the soil below the frost line, far below the snow, they prefer to eat insects and worms, not plant matter or seeds. Moles tunnel quickly. Unlike voles, they surface occasionally. When they surface it creates a mini-volcano-like dirt mound. Moles are not the creatures whose tunnels I uncovered.
Although the Northern Short-tailed Shrew prefers to tunnel in the subnivean zone, shrews are also too large. They measure almost 5” long, and also prefer insects over seeds and plants. A note of caution for you, shrews are venomous mammals with toxic saliva. Anyone who tries to handle a shrew, may receive a painful bite caused by their venom which can paralyze or kill small animals.
Pine Voles measure just 3-4 inches from their nose to their bottom (not including their short tail), and dig tunnels less than 2” in diameter. Their dining habits can be particularly upsetting to gardeners and homeowners since they really enjoy dining on plants. Pine Voles don't make my list of suspects either since their nests and tunnels are about a foot below ground in light, loamy soil. 
Meadow Voles are the most likely candidate. They spend most of their time above the ground or in shallow tunnels in dirt or snow. Measuring 3.5 to 5 inches long from nose to bottom, they have tails about 2 inches long. Meadow Voles' eat plant matter, seeds and some insect parts. They seem to be a perfect match.
These are all fascinating creatures. Most of them eat more than their own weight each day. They can tunnel quickly. Voles breed prolifically throughout the year, bearing as many as 40 young per breeding female annually. Which is great for their predators, since they are an important food source for hawks, owls, coyotes, snakes and foxes. Due to their popularity among predators, their life expectancy is rarely more than a year.
With the deep snow cover we've had this winter, predators like owls, hawks, etc. will have trouble finding prey which will affect their populations. Meanwhile, under this deep cover, the populations of moles, voles and shrew will grow rapidly since they each have multiple litters each year with broods ranging from 3 to 10 young.
With this information, I might be tempted to trap them or use deterrents. But, as difficult as all this snow has been for me to deal with, my sympathies go out to all creatures trying to survive in this environment. So, they're safe for now. I'll just be sure to keep the feeders full so there is enough for the birds to share with these subnivean creatures.
I encourage you to visit my sources for more amazing facts:
Down to Earth, Specialists in Education, Leadership and Training. http://www.down2earth.org/funstuff8.htm
URI Mole Fact Sheet: http://www.urimga.org/fact_sheets/Moles.pdf
URI Vole Fact Sheet: http://www.uri.edu/ce/factsheets/sheets/voles.html
WikiPedia: http://en.wikipedia.org/wiki/Northern_Short-tailed_Shrew
The great illustration above is by Mary Lamb-Greene. I found it at KidoInfo's blog from a review of “Living Under the Snow”, a children's book written by local author Kristen Swanberg, who is the Senior Director of Conservation, Audubon Society of Rhode Island.
Memere's tiny yard. As with previous generations, lilacs are a classic staple. Memere's yard was wrapped cozily with a mature, sturdy row of pale lilacs. Traditional lilacs can make a formidable screen, growing up to 15 feet tall.Bloomerang will give you abundant showy blooms in the spring that attract butterflies, are deer resistant and great for cutting. It grows in a bushy mound with small foliage. Later blooms are not as full, but still quite enjoyable. Bloomerang's deciduous foliage is mildew resistant.
Just give your Bloomerang well-drained soil, slow-release fertilizer in the spring, and plant it in a sunny spot. For best blooms, clip fading flowers to encourage additional flowers. New flowers will grow on every stem, both old and new growth. Bloomerang flowers nicely in container gardens, as a specimen, mixed in a perennial garden, and even makes a lovely low hedge.
Buried in snow? Treat yourself: imagine visiting Woodbridge Greenhouses this spring. Try this: close your eyes, take a slow, deep breath, and imagine yourself on a warm, sunny day in May, inhaling the timeless sweet scent of purple-pink lilacs. Mmmm. Visit Bloomerang's at Woodbridge Greenhouses, and take one of these compact, fragrant lilacs home to your garden.