This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Catoblepas (Medieval Bestiary)
One known description of the Catoblepas is said to resemble a cape buffalo, with its head always pointing downwards due to its great weight. Its stare or breath could either turn people into stone, or kill them. Pliny the Elder described the catoblepas as a mid-sized creature, sluggish, with a heavy head and a face always turned to the ground. He thought its gaze, like that of the basilisk, was lethal, making the heaviness of its head quite fortunate.
The catoblepas is often thought to be based on real-life encounters with wildebeest, such that some dictionaries say that the word is synonymous with "gnu". Other depictions have it sporting the head of a hog and the body of a cape buffalo. It is sometimes known as an African version of a Gorgon.