Serendipity

I'm reading Darwin's paper on earthworms. At one point Darwin describes the worms' habit of plugging the mouths of their burrows with leaves. Sometimes, he writes, they use pine needles - the type that come in pairs, joined at the base.

As the sharply pointed leaves diverge a little, and as several leaves are drawn into the same burrow, each tuft forms a perfect chevaux de frise.

Not being familiar with that last phrase, I looked it up online; Wikipedia provides a helpful picture. They are precisely the sort of barricade used by fortresses in Skyrim.

Darwin and video games. How 'bout that?