I have a ton of up close pictures, and a few times they are licking it. I swear they smell the batteries. But that seems weird. The same thing was happening to me last year. I have never put anything out.
When calling coyotes, more often than not they will circle on a target they are
coming into and approach from the downwind side. Presumably they do this in
order to align what they smell, with what they are hearing.
This means that you should always have your downwind side camouflaged and have
an open shooting lane. If the area is heavily covered the coyote could come in
take a look and be gone, with you none the wiser.