I'm hearing and seeing flocks of geese in the air this autumn. I say hearing and seeing in that order because I hear them first, then look for them in the sky.
One of the first times I heard them this fall, at first I didn't recognize the sound at first. I thought it sounded like someone's radio cutting in and out.
It also reminds me of the song in The Sound of Music, with the line "wild geese that fly with the moon on their wings." I mostly see them in the daytime, though.