The animals wallow beside bodies of water and erode deep trails linking them to pastures.
The snow accumulates in huge piles, which are then pushed and prodded into 18-inch-deep trails using fuel-guzzling snow-grooming machines that look like sleek bulldozers.
Puerta, in the last eight of a grand slam for the first time, dug deep after trailing two sets to one, before running out a 6-2, 3-6, 1-6, 6-4, 6-4 winner.
She hugs me, thanks me for "intelligent questions", and I watch her go: a pale slip of a woman in the dark night air, deep thoughts trailing behind her like exhaust fumes as the car turns out of the road.
Today, Boston College built a far deeper hole, trailing a talented if unproven Stanford team by 10 points in the fourth quarter.
The threads can go 10, 15, 20 deep before the trail stops.
This was all very well, but the canyon is one mile deep, and the trail itself about 10 miles long, and that translates to a very arduous walk, especially for an 8-year-old.
There is one bench off a trail deep in the woods that surround the Forest Refuge, beneath a moss-covered, jagged promontory.
Going up, the day was fine, but the trail deep-drifted and slopping wet at the margins.
"And we're working deep off the trails, places where you'd think you were in the middle of Catskills".
She's walking or perhaps trying to run on a hilly golf course, a line of deep, black footsteps trailing behind her.
