Ok so im new to emus i purchased 2 in march and have done nothing but worry about them. every little thing makes me think something is wrong. my problem today is that one of my birds is acting really tired even when he stands up his eyes are shut and he sits back down and goes to sleep. they have been out all day running and playing at around 5 i noticed the smaller of the 2 shiver a little so i brought them straight in. is it normal for them to be so sleepy and stand with eyes shut?