Very little is known about the "Experimentator". The term may refer to a person or to a text, or it may be a collective term for more than one author or text. Thomas of Cantimpré quotes the Experimentator extensively in his Liber de natura rerum. The work is only known through Thomas's quotes; no copies of any original text are known to exist. Since Thomas wrote his encyclopedia in the mid-thirteenth century, the Experimentator text had to have been written before that. Modern efforts to identify the "Experimentator" as medieval (or earlier) author have not been successful.

Thomas's quotes from the Experimentator in Liber de natura rerum can be seen under the Texts tab above.

Thomas quotes the for the following animals.