Nature Note #179: Strange Clicks and Whirring Trills
Tik. Tik. Tik. Tik-tik-tik-tik-gigigigigigigigigigigi. Tik. Tik. Tik-tik. Gigigigigigi. A high-pitched buzz, almost imperceptible shivers from the boughs of the spruce near my window. A small insect, barely a few inches long, sits on a branch. It cranks out a tune produced by it's wings rubbing against one another. This act is called stridulation and is being performed by a creature called a bush katydid. Now whether it is a northern bush ( Scudderia septentrionalis ), or a treetop bush ( S. fasciata ), or even a Texas bush katydid ( S. texensis ), I can't be certain. The fact is that my ears, as dull and imperceptive (at least compared to other animals) as they are, picked up these small vibrations used to attract a female into the male's territory. Those of us with access to trees, meadows, or even an open backyard can experience the variety of songs produced by this annual summer symphony. Their mixed signals and sounds delight us as we rest in our beds after a lon...