In the animal kingdom, anything goes when it comes to dong size. The animals with the largest penis-to-body ratio are all over the map. Some of them are tiny.
When you think of large genitals a barnacle is probably the last thing you think of. In fact, in proportion to body size, barnacles have the largest.
Put down the rulers, guys — whether your penis is the "right" size depends on the proportions of the rest of your body, a new study finds.