"Source Pathfinder #55: The Wormwood Mutiny pg. 72 A cleric of Besmara may give up one domain in exchange for a bird, blue-ringed octopus (Ultimate Magic 117), king crab (Ultimate Magic 119), monkey, or any of the familiars presented in the Core Rulebook. The cleric uses her cleric level as her effective wizard level for this purpose. A ranger who worships Besmara may select any of the creatures listed above as a familiar instead of choosing an animal companion. The ranger’s effective wizard level for this ability is equal to his ranger level – 3."