A common bird of the northern hemisphere, Pica pica, of the crow family ( Corvidae), having a long pointed tail, black and white plumage, and a noisy chattering call, proverbial for its habit of taking and hoarding bright objects and regarded by some as a bird of ill omen. Also (with distinguishing word): any of several other long-tailed birds of the crow family, esp. of the genera Pica, Cyanopica, Cissa, and Urocissa.——牛津当代大辞典

a bird with black and white feathers and a long tail.——朗文当代大辞典  @en