It's a rough-and-tumble world in the animal kingdom. Some creatures survive on strength, others on sheer guile, and others by, well, looking like poop. Following are a few examples of animals that aren't too proud to dress down to keep themselves safe and keep food on the table.
First, we see Arkys curtulus, aka "the bird-dropping spider." It really has the poo look down.
Here's a giant swallowtail butterfly (Papilio cresphontes) larva looking not-yummy. If you were a predator, would you eat one if you didn't have to?
You're thinking this is a worm, right? Well, it looks like one, except it's underwater and goes by the only slightly more appealing name of "common sea cucumber." It's adept at blending in with its surroundings -- and looking like ... you know.
Here's another bird-dropping spider (Celaenia excavata). The key to dodging predators and living for another day, it will tell you, is to look like a Whitman's holiday sampler gone horribly wrong.
Meet Pasilobus, another spider that doesn't mind looking like crap.
As for exactly why spiders don't seem to mind the raw-sewage look ... your guess is as good as ours.