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<p>the net is calculated differently in different countries; in the US and Canada the given mesh size is equivalent to two sides of a mesh square, while in the UK it is equivalent to one side. Ringers must choose a mesh size that appropriately targets the desired species, with smaller birds requiring a smaller mesh size. Nets can range from 1.5 to 18 metres in length, and from 1 to 3 metres in height depending on the number of panels. The thread weight and ply (number of strands) can also vary. Common construction materials include nylon, polyester,</p><p>
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