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In page Beagling:

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The attire for traditional beagling on foot normally consists of a green coat and stockings, white breeches and a cap (similar in style to those worn when riding a horse), or a green flat cap. Many packs have a coloured collar to distinguish themselves from other packs. As with foxhounds a handful of packs have a different coloured uniform, either red or blue coats being worn, while in a few hunts the huntsman's coat may be a different colour from those worn by the whippers in. Beagles generally have a higher pitched "cry" when hunting a line than foxhounds do.