Because the ability of the Sung artists to work from nature was built on the foundation of observation, when you share their ornithological experience many problems are revealed in what are faked Sung paintings as it is possible to observe whether they have been done from life or are just imitations.
由於宋人的寫生能力是墊基在觀察功夫上，因此若能與宋人一樣擁有觀察鳥類生態的經驗，可以藉此看出很多宋畫仿作的問題，也較能夠判斷係屬寫生或臨摩而來。