It is getting colder out and I noticed every time I go into the coop there are a ton of sparrows flying around in there. I assume they a eating the chicken feed but I don't know if this is a problem or if it is bothersome to the chickens? Can these birds cause larger problems like disease or anything. I'm new to chickens and I get a little worried about all the small things. I would rather prepare and prevent than treat and possibly lose some of my chickens.