Lu Ji’s observations and descriptions of animals and plants adhered to the principle of seeking truth from facts. In ancient times, people regarded Qilin (or Lin for short) as an auspicious animal. Based on the morphological characteristics of "there is a Lin in Bingzhou (today's Zhongtiao Mountain area of ??Shanxi Province), which is as big and small as a deer", Lu Ji concluded that the Lin in Bingzhou was "not an auspicious Lin". . Therefore, "Poems on Plants, Trees, Birds, Beasts, Insects and Fish" has a certain scientific level. But on the other hand, Lu Ji uses an intuitive description method after all, so there are also some shortcomings. For example, the parasitic phenomenon of "a borer has a child and the fruit bears it" is regarded as mysterious. It is also said that "Tongs include Qingtong, Baitong, and Red Tong, which are suitable for qin and harp." In fact, only Baitong (Paulownia) can make musical instruments such as qin and harp. As for "the people of Yunnan and Yanghe thought that they were clothed", it was not what Lu Ji said. The explanation of "Zou Yu" is also superstitious.