They're just too darned interesting! I've written and written and written, and just when I think I've got it all wrapped up in a neat little bow, I think, "Drat! I forgot to mention..."
So, I have pages of stuff (I am trying to keep it to two, max) and a LONG list of don't-forget-to-mentions following that.
I put it away.
I can't look at it any more.
I'll write about something boring. Like Reptilia or Aves. Should I put the dinosaurs with reptiles or birds? Drat!
Maybe I'll write about Arachnids instead.
Yeah, I don't like them. They're scary.
I'll think about sharks another day.