Parasites: Nature's Ultimate Puppet Masters

There's a parasite that can grow to 30 feet inside your intestines and you might not even know

it's there. The fish tapeworm lives in your gut, absorbing nutrients through its skin

because it doesn't even have a mouth. But here's the wildest part: some parasites are so good at manipulating

their hosts that they literally change their behavior to get eaten by the right predator.

Like this snail parasite that makes its eyes pulsate with bright colors, turning it into

a flashing neon sign for birds. The parasite needs to get inside the bird to complete

its life cycle, so it transforms its host into the perfect target. Evolution created

the ultimate puppet masters, and they're living inside animals all around us right