I've had chickens for three and a half years now. One of my favorite things with the chicks is to take them into the grass for fresh air and sunshine. Every batch of chicks I've ever had have run, stretched and dust bathed. These chicks are 4 weeks old and every single time I take them out they instantly lay down and sleep. I have tried everything to get them to play but they just sleep. When I put them back in the brooder they run all over. Are they just weird?