What to put on mesh part of chicks incubator?

For the mesh part of a chick incubator, it's best to use a non-toxic, easy-to-clean material like a fine wire mesh or screen. This allows for proper air circulation while preventing chicks from getting stuck or injured. Additionally, consider placing a layer of paper towel or soft bedding on top to provide comfort and absorb moisture, helping to maintain proper humidity levels during incubation.