Abu Dawud Book 21, Hadith Number 3786.

Narated By Thabit ibn Wadi’ah : We were in an army with the Apostle of Allah (PBUH). We got some lizards. I roasted one lizard and brought it to the Apostle of Allah (PBUH) and placed it before him. He took a stick and counted its fingers. He then said: A group from the children of Isra’il was transformed into an animal of the land, and I do not know which animal it was. He did not eat it nor did he forbid (its eating).