I consider my girls' wattles and combs to be a type of mood ring. The redder the better. The paler the more stressed or tired. I have found that when my pullets begin to squat when I reach down the pet them is the tell-tale sign they are going to lay . . . . and soon. Like within the next 7 days. Now I'm no "chicken whisperer" (the closest I get to that title is when I whisper "chicken" to my wife so the dogs don't hear me ) but that's my experience.