Dry washes are the country roads of four-footed arid land drifters, and good places to set camera traps.
They're fickle places, though, especially in winter, when a rumbling wash of mud, gravel, and cobbles can sweep your beloved cam away. Forever.
The channel in the rock sediments seen here is a promising but unusual feature.
We all walked right on through the gap, realized its uniqueness, and got a little jazzed about it.
Practically every mammal bigger than a rat will be obliged to pass through that channel, just as we did.
Take a look at the top of the page again, and you'll see a couple of rocks at the bottom of the channel.
There's a smelly treat under that stone, so we're expecting passersby to pause for a sniff before resuming their journeys.
That will give the camera time to capture their photo IDs.