Right, and when you notice that a bunch of organisms share a trait, the fact that they share that trait in spite of their common ancestor not sharing it is inhe

Right, and when you notice that a bunch of organisms share a trait, the fact that they share that trait in spite of their common ancestor not sharing it is inherently interesting, right? We know that traits are heritable, so when you have a bunch of different organisms that exhibit the same characteristic, if you can trace back and determine they are all specialized descendants of some ancestor which first developed that characteristic, that’s the complete story right there. But when we see the same behavior appear in different organisms without them sharing a common root for that characteristic that’s interesting precisely because we need another means to explain it. I mean, if grizzlies and polar bears could interbreed even though their nearest common ancestor was, say, some kind of small Cretaceous rodent, then weld have some explaining to do, right?