Bat calls, “songs” to keep to the theme of this blog, are hardly inarticulate shrieks. In fact, bat echolocation calls are finely honed sonar pulses and have a complex and time-varying structure. The audio and rather low-resolution spectrograms in my earlier postings should hint at that.
There’s a fair amount of interesting scientific research out focusing on bat echolocation, in a much more systematic and detailed way. I was delighted to find not only the article below, but an entire on-line journal whose content is completely free, readily accessible, and freely redistributable.