OK, one of my hens just did something that was kind of gross, and I need one of you more experienced chicken people to tell me what it was. (I've only been at this craziness not quite a year and a half, which is very hard to believe!)
I had all my chooks running around in the yard today. My (usually standoffish) EE, Maya, squatted down so I could scratch her back and pet her. And when I did, she stuck her butt high up in the air, opened her vent up WIDE (it was scary looking), and squirted some goopy liquid out. She did this twice in a row.

It was nasty! Was it some kind of mating thing? Was she getting rid of old rooster sperm (I think I heard they can do this)? I'm really curious.