I triede reserching on the website about chickens nose bleeding, but I didnt have any luck. I was letting the chickens out and I saw thick blood on the floor, I imeadiatly went outside and visually inspected all the chickens. I saw one chicken who is a sussex star, she is 4 years old (which i old for a hybrid hen) and I dont think she is laying. She had blood coming out of one nostril however she seems healthy, her eyes are fine and her poop is fine. None of the other hens have any trace of blood on them.Why did this happen, what could have caused it?