My chickens having been acting very strange lately, they used to run up too the door the moment they heard it bang, they'd follow you around the yard and would be walking around scratching all the time. Although yesterday all they did was sit under the trees and drink water, meanwhile there was a huge pile of food in front of them. This morning I woke to hear a lot of skwaking and clucking but I couldn't find any eggs, the weather is warm but there has been hotter days when they haven't been acting like this. Is this how they all act before laying? I think they're just over 4 months. Please help! Thanks.