I heard that they have two heads for that reason. Something about the number two, and infinity. What that has to do with two heads is beyond me.

[So yes, they're going down this path. The one over here. There's a little bit of water, even, but only a little. Vaguely scenic.]

Wiser men than me have speculated on their habits. And what I've heard comes down to this: if one of these serpents is left unchecked, it becomes a proper hydra given enough time.