Help me identify bird/animal sound
There is, what I had thought, was some kind of bird sound, that has become quite familiar to me over the years. The thing is I don't know what it is. I went to a web site that has recordings of birds singing that you can listen to. I went through a dozen or so samples from a long list of north American birds. Nothing even close. They all were more the typical chirping or tweeting, just in different patterns.
This sound is more like the hollow sounding whistle you get when you cup your hands together and blow into them. The sound is always the same...four notes, very rythmic, The first note a little longer followed by a second. Then a slight hesitation followed by two more close together.
I know this is a pretty trivial question, but I've wondered for a long time what bird or animal is making this sound. If anyone has an idea what I'm talking about based on my description, please help.
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