I saw something earlier in the season when I was watching bees when I should have been hoeing weeds in the field next to the hive. I was watching them land and take off and I saw a couple of bee who were evidently damaged or sick, kinda walk sideways to the edge of the landing board and jump of on to the ground. I went back to hoeing and kinda forgot about it . i inspected them the next weekend but didn't notice anything unusual. would this be caused by mites? I guess they are the cause of most birth defects, right?