I have a small flock of 6 girls, who I admit are very spoiled. This morning, they have all been jumping and "flying" around their pen, and even 2 of them got into a little fight. They have food, water, treats, a clean pen, no one is injured nor seems to be sick.... Why are they suddenly acting this way? Do they need their heat lamp back? (I live in WA, and they have not had their heat lamp at all over the past month or so due to the weather, but it is starting to get a little chilly again....) Thanks in advance!