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Bird netting or anti-bird netting is a form of bird pest control. It is a net used to prevent birds from reaching certain areas. Bird protection netting comes in a variety of shapes and forms, The most common is a small mesh (1 or 2 cm squares) either extruded and bi-oriented polypropylene or woven polyethylene.
The mesh gap is usually 50 mm and the twine will commonly have a diameter of 1.8 to 3.0 mm. Netting may be knotless or knotted: knotted is considered superior. The breaking strength of knotted netting is higher for the same diameter twine. Good twine will be UV stabilized and rot proof. For home-made nets, netting is the only specialist supply.
Small passerines are typically captured with 16-30 mm mesh, while larger birds, like hawks and ducks, are captured using mesh sizes of ~127 mm. Net dimensions can vary widely depending on the proposed use. Net height for avian mist netting is typically 1.2 - 2.6 m. Net width may vary from 3 to 18 m, although longer nets may also be used.
A net comprises threads or yarns knotted and twisted into a grid-like structure which blocks the passage of large items, while letting small items and fluids pass. It requires less material than something sheet-like, and provides a degree of transparency , as well as flexibility and lightness.
Using either the lace-maker or the net-maker method to tie the netting knot, several types of netting can be created. Diamond mesh netting goes back and forth, in rows. This technique is used for bags, hammocks, headbands and scarves. Another type is square mesh netting which also goes back and forth in rows but is worked in the diagonal.
Bird flu was first detected in Texas dairies in the spring, after officials believe one herd was infected by wild birds. So far, 16 states have had outbreaks in cows, with 865 herds affected.
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