Nidoran♂ is a small, quadruped, porcupine-based Pokémon with large ears, front teeth and red eyes. They are covered with spines primarily on their back which can release potent poisons if Nidoran♂ is threatened.
Nidoran♂ is the male of the species, and is noted to be one of the first Pokémon to denote gender differences. In the later generations, however, Pokémon with genders are marked with a ♀ or ♂ symbol, rather than being actual different Pokémon.
Nidoran♂ have a larger forehead horn than their female counterparts, Nidoran♀. They also have more spines, and are of a different color.
Nidoran♂'s large horns can secrete a powerful venom; unlike his female counterpart, the size of Nidoran's horns are indicative of the strength of the venom. He also has unique muscles around his ears, which permit them to be moved in any direction.
Nidoran♂ are fairly docile Pokémon, although they tend to be more alert and nervous than their female counterparts, constantly listening for the sounds of approaching enemies with their large ears. Their potent venom is used primarily as a defense, and most likely evolved to counteract their small body size.
Nidoran♂ live in expansive hot savannas and plains. They share their native range with Nidoran♀ and both species are commonly found in Kanto and Johto.
Nidoran♂ eat fruit and plants. This Pokémon's digestive system is unaffected by the poisonous plants.
This Pokémon was unavailable prior to Generation I.