Territoriality Memes

Natural selection doesn't have time for pleasantries. That male red-winged blackbird isn't asking if you want to "talk things out" when you enter his territory during breeding season. He's basically this meme incarnate—wings flared, ready to throw down. Sexual selection is just evolutionary game theory with feathers and hormones. The difference between passing on your genes and genetic oblivion often comes down to who can puff their chest out more convincingly. Darwin would've appreciated the simplicity: "Are you challenging me?" translates perfectly to "Are you threatening my reproductive fitness?" in about 8,000 species.