Can anyone out there reference a good and complete set of written vocal transcriptions for Northern Saw-whet Owl? Or perhaps direct me to a good set of sound recordings on line?
Most commercial (and on-line) sound recordings focus on the territorial monotonous whistled 'toot', and a few variations on this, and at least one contains a more explosive screech 'shrreeee' type call. These are also the calls described in most NA field guides. Sibley also describes a softer 'keew' or 'pew' which is one of the call types that hear most frequently in my area (Western Massachusetts).
I read, however, that at least 9 vocalizations have been described for this owl and wondered how to find out more about these? For a popular, and apparently quite common, small owl I'm having a tough time finding a broader range of voice descriptions than those described above.
Thanks in advance for any help you can offer.