The ubiquitous American Crows too have a code, which it is believed they use to locate specific trees for their nightly noisy swarmings.
The Institute for Bird Populations is a non-profit corporation dedicated to research and dissemination of information on the abundance, distribution, and ecology of birds, and to facilitating scientifically informed conservation of birds and their habitats.
From them we also learn that American Crows undertake short distance migration, utilize mid-story canopy nesting, produce clutches of between 3 and 8 which they incubate for 18 days and have a diet of mostly seeds, but also insects, carrion, fruit, nuts and eggs.
The above information and a bit of sleuthing should allow the seeker to find the decimal minutes of a crow-friendly, and cache-friendly, roosting spot.

You can check your location for this roost at GeoChecker.com.