This morning as I was walking to cool off from my early run, I could hear a distinctive bird song, "whir-a, whir-a, cheep, cheep, cheep, cheep". The bird was in a big tree near our home, I couldn't see it, but I could hear that it was just over my head. And the bird seemed to be counting. First the "whir-a, whir-a" and 6 cheeps, then the "whir-a, whir-a" and 8 cheeps, then 10, then 12, and even 14 cheeps. I kept walking and didn't hear if it kept going on and on, or if it took a break and started over again.
Counting by evens.
I thought that was kind of odd, so I decided to see if I could find the bird and it's song online. There are 3 different kinds of birds that I see in our yard, but I only know the name of one, the cardinal. So I googled and found a recording of a song that is very similar to the one I hear around our house, but that song is not exactly the same speed as my bird, and the whir-a is a little different than the bird I heard this morning. I kept searching and I read that: Cardinals learn their songs, and as a result the songs vary regionally.
Also, I read that: Cardinals have a distinctive alarm call, a short metallic 'chip' sound. In some cases they will also utter a series of chipping notes. It is often easy to locate Cardinals by their alarm call, since they will make it readily when humans walk nearby.
Sorry if I scared you, little guy!