translation.en: But I discovered, in researching further, really wanting precise reference, that one of the original lead birds had been sold at Christie's in 1994, and so I contacted an antiquarian bookseller who had the original Christie's catalogue, and in it I found this magnificent picture, which included a size reference.
translation.zh: 但在做了更多研究后 特别是需要精确参考的时候 我发现 一只原版的铅制雕塑 1994年在克里斯蒂拍卖行被拍卖了 所以我就联系了一位爱好古董的书商 他有克里斯蒂拍卖行目录的原稿 我从中找到了这张极好的图片 还附有尺寸参照