Parable of the Rat and the Bat

The rat to the bat: "Sir, up close you look almost like a rat. So, I'd want to call you cousin if you don't mind being that." The bat to the rat: "No way, impudent rodent, you're so crass, denizen of the foul gutter, you're without a touch of class. Listen, presumptuous fool, I swoop, you creep; you crawl, I fly. In evolution's totem pole, you're down below, I'm way up high. I'm a sibling of the larks, you're brother of the ticks and gnats. Remember this: Angels are to humans as bats are to rats!" Indeed, one must always be tentative in choosing a relative, for not all critters of the same fur huddle together, Sir.