Aani

In Egyptian mythology, Astennu (also spelt Asten, Isten, Astes, and Isdes) refers to a baboon associated with Thoth. It was also stated that Astennu was merely another aspect of Thoth, as the god could take the form of a baboon. He was one of four baboons who stood around the lake of fire at the place of judgement in Duat, and consequently associated with Utennu... Baboon may be an equivalent term for dog-headed ape. 

Among the Egyptians several kinds of apes were regarded as sacred animals, but the most revered of all was that which was the companion of Thoth, and which is commonly known as the Dog-headed Ape. In the Judgment Scene he sits upon the standard of the Great Scales, and his duty was to report to his associate Thoth when the pointer marked the middle of the beam.

In Ancient Egyptian religion, Aani is the dog-headed ape sacred to the Egyptian god Thoth. "One of the Egyptian names of the Cynocephalus Baboon, which was sacred to the god Thoth."
  

An image [above] in the Papyrus of Ani (ca. 1250 BC), a version of the Book of the Dead, has been described as follows:

The scene shows four cynocephalous baboons sitting at the corners of a rectangular pool. On each side of this pool is a flaming brazier. The pool's red colour indicates that it is filled with a fiery liquid, reminding one of the "Lake of Fire" frequently mentioned in the Book of the Dead.


-From Wikipedia