Here's a sample from David Wolman's list of the 10 Worst Evolutionary Designs:
7. Human stomach. People can digest a lot – except for cellulose, the primary component of plant matter. Why don't we have commensal bacteria in our guts to do it? They're busy helping termites.
8. Slug genitalia. Some hermaphroditic species breed by wrapping their sex organs around each other. If one of said members gets stuck, the slug simply chews it off. What. The. Hell?
9. Quadrupeds. Let's say you're a four-footed animal. Now let's say you get a wound on your back, or an itch, or a bug wandering up there. Tough luck, kid. You probably can't do much about it. Hope there's a low branch around.
