I had a tough time with this one. The caption said if it didn't move while you walked by you wouldn't see it.
I looked and looked, is that a bird, is that a squirrel, is there a snake in the grass? Couldn't see it.
Out of frustration I checked the comments.
1 - I found it. Oh shut up.
2 - I'd be dead. Aha, something dangerous.
Went back and spotted it right away.