Bird nets manufacturer Sona agrotex's Bird net Why are Bird net used ? Bird net is made of UV stabilized high density polyethylene monofilament yarn. It is lightweight and easy to install. Bird net is mainly used in the gardens to prevent birds, butterfly and other insects from eating the crops, vegetables and fruits. Bird net can be used as pond netting to prevent herons from eating the fish and prevent the leaves and debris from falling down to the water. Bird net can be installed on the side or the drape over on the tree to prevent bird from damaging the tree.