A dry wash channel set

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.