Alexander the Great's Campaign > Aeternae
The Aeternae were a race of legendary creatures mentioned during the campaign of Alexander the Great as they passed through the northern plains of India. The Aeternae apperently killed some of Alexander's military and were described as;
"Bony, saw-toothed protuberances sprouting from their heads."
Giants, Monsters, and Dragons: An Encyclopedia of Folklore, Legend, and Myth by Carol Rose page 4
Matthews, John and Caitlin (2005). The Element Encyclopedia of Magical Creatuers. HarperElement. p. 8. ISBN 978-1-4351-1086-1.