One of Australia's most highly regarded songbirds, the Australian magpie has a wide variety of calls, many of which are complex. Pitch may vary as much as four octaves, and the bird can mimic over 35 species of native and introduced bird species, as well as dogs and horses. Magpies have even been noted to mimic human speech when living in close proximity to humans. Its complex, musical, warbling call is one of the most familiar Australian bird sounds. In Denis Glover's poem "The Magpies", the mature magpie's call is described as "quardle oodle ardle wardle doodle", one of the most famous lines in New Zealand poetry, and as "waddle giggle gargle paddle poodle", in the children's book "Waddle Giggle Gargle" by Pamela Allen. The bird has been known to mimic environmental sounds as well, including the noises made by emergency vehicles during the New South Wales wildfire state of emergency for Australian bushfire.