<P> Mist net come in a variety of sizes and lengths according to the bird's size . All nets are made from a black nylon material and come with 4 shelves to catch the birds once they fly into the net . When purchasing a mist - net for sparrows the height usually stays the same at 2.7 meters but varies in width at 6 meters to 18 meters at a 30mm mesh . Determining net size for large sparrows to jays are 2.6 meters high and varying in widths at 6 meters to 18 meters at a 38mm mesh . If the study requires the banding of large owls a specific net is required and it is made with a heavier material to withstand the talons of the owl at 60mm mesh . Banding hawks also requires a heavier material at 100mm or 127mm mesh . However, some nets for larger birds include an additional shelve at 5 instead of 4 . </P> <P> Banding pliers are an essential tool that helps place the band around a bird's leg . These pliers come in different sizes as determined by how wide a bird's leg is . Pliers are sized between 0A - 1A, 2--3, and 3B, 3A, and 4 . </P> <P> The band size is determined by using the leg gauge . A leg gauge is placed around the bird's leg which determines the circumference of the leg . After identifying the size of a band it is then placed on around the leg with the help from the banding pliers . In Australia, band size range from 1 to 15, plus special sizes for birds whose leg shapes require special bands, such as parrots and pelicans . </P> <P> When looking through the Pyle textbook some birds can be identified by the wing cord . The next essential piece of equipment is the wing ruler, which is used to determine the length of the wing for data collection, research purposes, or determining species . </P>

Why do parrots have rings on their legs