I ve read the article and have a question in reference to the female being silent. I have been observing the grey's n my pool for a few years now and have even wittnessed mating. I could swear
i've seen and heard her call. I can chirp like them and they will answer me. The pair sat on my fence after leaving the pool. I was less than 1' away and the larger of the two answered my call. Can there be exceptions? And why do they make another type of call when they are in close proximity to another frog?