Approaching the questions we can't answer

Last week something went down between stella the dog and some unfortunate bird. We're not really sure what, since we didn't find anything other than feathers. Maybe it was just a play date? This is one of the spots where the feathers appeared:

Yesterday Carter went out to give Stella her morning treat and took one look at the feathers and turned to Seth and asked, very concerned, "wat happand a birdie?"

I don't know how he knows that feathers mean birds, lots of feathers are a bad thing, and I certainly don't know what did happen to the birdie. Somehow that seems like a fairly advanced level of understanding and concern coming from a 20 month old.

Pretty soon I'm going to have to start referring him to his father for explanations of the foundations of physics.