This is my 3.5 month old Orpigton cockerel. He's generally incredibly spry, energetic, friendly, curious - All that awesome chicken stuff. Tonight my girlfriend and I checked on the coop to see him sitting on a roost with his head down below his body, bent under him. Thinking that didn't look like a good sign, I picked him up to get a better look. At first it looked as though he was convulsing, but now I see it's more of a desperate, furious pecking at his neck and chest. He can straighten it out and walk around normally, then he just faceplants down, beak into his neck/chest, making little sooking noises. My girlfriend and I watched him while trying to figure out what could be wrong, and he can eat normally, drink pretty much normally (he did have some water dribble back out about half the time, but he recently chipped his beak somehow so I'm not sure if it's that), flap and walk around looking alert and completely normal... Then straight back to this. His crop feels extremely full, which isn't surprising as it's night time and he's a total pig, but it also felt a bit harder than usual, maybe a slightly strange texture. I'm worried and confused, what do you think this is? I've looked into impacted crop, wry neck, checked for ticks (none that I could see)... He's not puffed up, not lethargic, not pale, he's eating and drinking - He's just bent upside down and fixated on his chest.