原件长16.6厘米，残宽5.9厘米，厚1.2厘米。1977年河姆渡遗址第三文化层（距今6500——6000年）出土，现藏浙江省博物馆。
象牙正面磨光，上阴刻两头相对、身相连之尖喙长尾鸟，右鸟长颈饰三冠羽，形体偏大，似为雄性；左鸟长颈饰一冠羽，形体略小，似为雌性。两鸟引颈振翅，昂首昵视。中央连体处有五重同心圆圈，上部饰火焰纹若日出东升。
鸟与太阳均为河姆渡先民崇拜的图腾。尤其鸟具有着卵生多产的神性，双鸟交感繁殖，意味着生命或生育，包含着河姆渡先民祈祷氏族人丁兴旺、平安康宁的殷切愿望；同时，也反映出双鸟育阳、时和岁丰、百年好合、欢乐祥和的主题。
作品雕刻技艺精湛，线条柔和流畅，构图朴拙完美，堪称人类史前雕刻艺术的杰作。
The original object is sized as 16.6 cm in length, 5.9 cm in remaining width, and 1.2 cm in thickness. It was unearthed in the third layer of the Hemudu site in 1977 (6,500 - 6,000 years ago), and is currently in the collection of Zhejiang Provincial Museum.
The ivory object has a polished front, where incised two sharp-beaked and long-tailed birds with their bodies conjoined. The right bird is relatively larger in shape with its long neck carved with three crest feathers, and it seems to be a male. The smaller left bird has one crest feather, seeming to be a female. The two birds, raising their heads and wings, look intimately at each other. At the center of the object where two birds connect, five concentric circles are carved with a flame pattern on top, symbolizing the sunrise in the east.
Birds and the sun are both totems worshipped by the ancestors of Hemudu. The mating and breeding of the birds, in particular, represent life or fertility due to their oviparous and multiparous features. Such worships denote the earnest wishes of the Hemudu ancestors who prayed for their clans to be safe, healthy, fruitful and multiply. At the same time, it reflects other themes, including two birds nurturing the sun, good harvest, harmonious and long-lasting marriages, joy and peace.
The techniques of the work are excellent and exquisite. The lines are soft and smooth, and the composition is simple and perfect, which can be called a masterpiece of human prehistoric carving art.
