My 3-day old chicks are doing well, except tonight I came home and saw some reddish orange poop in the brooder. I immediately thought it was blood--it doesn't look like the rest of the poop at all, and there was just one abnormal poop. The other poops looked normal. I can see their poops really well since they're on paper towels on top of pine shavings (they were eating the pine shavings and will still go for them along the edges of the paper towels if I'm not careful). Any ideas what this might be and what I'm supposed to do?