Lice are more common in winter weather. They can be brought in on new birds and wild birds. Lice have 6 legs, while mites have 8 legs, so you might try a magnifying glass and have a look. I would always remove the bedding far away where the chickens don’t get into it. Mites can sometimes be...
Lice are most common, and look beige, fast moving, and are on 24/7. They leave white to gray clumps of eggs at the base of feathers. Mites are smaller, more slow moving, leaves
specks of droppings on the skin, and may be on all the time (northern fowl mites,) or just at night in the dark...