Leopard to Sanskrit ("snake", "tiger" or "panther"), and probably derives from a Mediterranean language, such as Egyptian. The name was first used in the 13th century. Other vernacular names for the leopard include graupanther, panther and several regional names such as "tendwa" in India. The term "black panther" refers to leopards with melanistic genes. A term for the leopard used in Old English and later, but now very uncommon, is "pard". The scientific name of the leopard is "Panthera pardus". The generic name "Panthera" derives from Latin via Greek πάνθηρ ("pánthēr"). The term "panther", whose first recorded use dates back to
Common leopard gecko exists in adult males and females, but can be difficult to determine in young geckos. The underside of a gecko truly determines the sex of the gecko. Males have pre-anal pores and hemipenal bulges while females have smaller pores and do not have external bulges. Males can determine the sex of other common leopard geckos by smelling pheromones on their skin. Males respond to males with aggressive behavior while they demonstrate courtship behavior towards females. Towards other males, the male would raise itself up from the ground, extend his limbs, and arch his back with the swelling of the tongue