The Bouda are part of Ethiopian folk religion. Chaosium first used them in 2009 for the Call of Cthulhu RPG.
The Bouda are race of shapeshifters who at will are able to change from their human forms to hyenas, usually doing so at night. In their beast form, they look exactly like hyenas, except larger and heavier. Being up to a ft taller and at least 50 pounds heavier.
They have a complex social structure and are fiercely loyal to each other. Bouda have worked for a number of Mythos deities, but are aligned and loyal to none. They've roamed across Africa for over 20 million years. It's a race skilled in magic and famous for its metalworking.