The animals. Recently, I took a walk through Lundy Canyon (near Mono Lake, on the Eastern side of the Sierra Mountains). We saw this beaver dam in the lake,
and then we saw this,and this.
And then we started seeing chewed off tree stumps everywhere.
I don't know about you, but for me, beavers had only really existed in cartoons and Narnia. So I had a back-to-childhood experience (meaning I got ridiculously excited) seeing real life evidence of real life beavers doing their real-life thing.