That's a katydid that mimics a dying leaf, with stunning accuracy.
Nature never ceases to blow me away. I mean, mimicking a leaf or a stick, or another poisonous or foul-tasting critter, sure. I can dig that. (For the record, the latter is called Batesian mimicry, while two dangerous species coming to resemble each other is called Mullerian mimicry.)
I've seen things like this in the wild, mostly in the tropics: poisonous snakes that look like piles of leaves, fuzzy caterpillars that look like bits of moss but will make you sick as hell for a day if you brush against them.
It usually goes something like this:
Guide: That bug, there. Look. [Points]
Me: No, where?
Guide: There. [Jabs finger at something]
Me: I don't see anything.
Guide: Right. There. [Touches whatever it is with a stick, or just picks it up]
Me: No, I don't--Oh. Holy crap.
It always makes you conscious of how much else you're missing. Lucky they're all tiny. What if there were things that looked just like trees, or hillsides?