Clover, sorrel, nettle and thistle are common, and grow wild in Greater Manchester. Common heather (Calluna vulgaris) dominates the uplands, such as Saddleworth Moor, which lies within the South Pennines and Dark Peak area of the Peak District National Park. The Rochdale Canal harbours floating water-plantain (Luronium natams), a nationally endangered aquatic plant. In 2002, Plantlife International launched its County Flowers campaign, asking members of the public to nominate and vote for a wild flower emblem for their county. Common cottongrass (Eriophorum angustifolium), a plant with fluffy white plumes native to wet hollows on high moors, was announced as the county flower of Greater Manchester. The house sparrow, starling, and blackbird are among the most populous bird species in Greater Manchester; magpie and feral pigeon are common and breed in habitats across the county. The South Pennines support internationally important numbers of golden plover, curlew, merlin and twite.