I work in a nicely landscaped office park. The landscaping elves recently laid down a nice fresh layer of shredded bark mulch around the plantings.
Just now, while crossing between buildings, I came across a squirrel burrowing in the mulch by the edge of a shrub. He was waist-deep in the stuff, worrying away at something underneath.
He seemed totally oblivious to what was going on up above. It seemed very un-prey-like behavior. I stepped really close, maybe two feet away, and waited. Just stopped and watched and waited for him to notice me.
After a moment, he kind of spazzed out. Jumped straight up a foot and a half while thrashing around frantically. He kind of melted into the shrubbery, vibrating like some kind of insane wind-up toy.
I'll give him points for a quick get-away, but a Zero as far as wariness goes. If I'd been a raccoon or fox or coyote, I'm sure he'd be digesting by now.