Wondering about that bird outside

Dave and Jack have both been quite intrigued recently with the bird that has taken up residence in front of their home. The bird keeps saying, "Poo-tee-weet?" to the cats. They aren't quite sure what the bird is trying to say, but sometimes Dave responds with a quick, "mrauuw." And sometimes Jack responds, in a much higher tone, with a longer "maaaaaeeehhh---," trailing off at the end.