I'm new to chickens - 5 weeks in! One of my girls, Henrietta, an EE has been acting funny the past few evenings. She's been pushing herself under another hen. She looks like she's trying to dive under! She won't stop until she is completely underneath the 2nd hen, Zebra, who seems nonplussed by the pushiness. Zebra, a Barred Rock, is accommodating and will actually sit on Henrietta. Only after she is sitting on her will Henrietta relax. Sometimes it looks like she just wants to hide her head under Zebra. All of this is preceeded by Henrietta chirping nonstop. It's a special chirping she ONLY makes when she's about to start the diving. She seems FRANTIC and scrambles to get underneath. Once she's under, all 4 settle into a sleeping pile! Henrietta is eating, drinking and pooping just fine. Otherwise happy & healthy girl. Has anyone ever seen this? It looks almost instinctual, like she's compelled to do this. Any and all thoughts appreciated!!!