Douglas the Blue Heron

There's something about Blue Herons.  They're just so cool.  They make me think of pterodactyls.

What sound does a blue heron make, I wonder?  In reality I think blue herons are pretty quiet, but in my imagination, they have high-pitched, screeching voices that would echo across our cornfield and bounce back from the treeline.  I love to watch their stealthy steps as they stalk minnows and listen for the telltale swish of an unwary fin.