Thanks. There's a fuzz factor on the number, naturally, but it's in the ball park. I'm really surprised myself and have been for a long while.
Dead (usually before birth), if it's a lethal factor. Nothing, if it's not, because in practically all non lethal cases there's no visible effect.
BYD (who collects video among other things, according to their TOS) is pretty conspicuously missing from the list.
I think you can ask duck for sources or links each time you want them, but it would make some sense for a search engine in particular to give the links in any case.
Not being written in CL?