The fox and bobcat sounds were certainly surprising - and creepy! I want to set my alarm clock to the northern saw-whet owl's call, I love it. I've never heard an owl in person but after following the barred owl nest cam last season I'd recognize their sounds anywhere.
I was most surprised to learn that owls that are similar in size can eat very different kinds of prey, and that you can tell what type of prey they eat by looking at their feet.