THey are singing here too, but we have both and I don't know enough about them, but there are two different ones here who come out at different amount of years, but every so often, like this year, they both come up the same year and talking about a whirl that sounds like alien space ships whirling through the sky..... well, some nights are louder than others and sometimes it's almost a pleasant softer whirr in the day. So neat.