Bighorner

Bighorners are mutated bighorn sheep found in the Mojave Desert around New Vegas.

Characteristics
Evolved from Bighorn Sheep, Bighorners are dedicated herbivores and have been domesticated by Settlers in Goodsprings and Jacobstown for their horns, meat, and fur. They are generally laid-back beasts with surprisingly docile dispositions, in spite of being quite capable of being extremely dangerous when provoked. They are not suitable for moving cargo like Brahmin are; if one attempts to mount a Bighorner with a Cargo Harness, they more often find that the beast simply sits down and takes it easy until the gear is taken off.

Combat
In combat situations, Bighorners are unique in that they are rarely outright hostile. They form fair-sized herds, usually with an alpha male (a Bull), several females (regular Bighorners), and a few young children. Bighorners will not actively pursue the Courier like other monsters, and, if left alone, are content to graze and mind their own business. Getting too close to wild Bighorners agitates them; they will growl and snort if someone gets too close, and will turn hostile if the offender doesn't back away from them fast enough. Bighorners with young, however, become enraged if their young are approached, and will fight to the death with very little provocation in order to protect their offspring.

Bighorners can't take a huge amount of abuse (they are squarely on par with a Radscorpion in terms of health), but their head-butting attacks are absolutely devastating, capable of sending enemies flying backwards or knocking them down. Throw in the fact that Bighorners can inflict heavy damage and run very fast, and they can make an intimidating foe for the unprepared.

Purportedly, A critical hit head shot is a killing blow against one, causing the bighorner's horns to fall off.

Bugs
Bighorners can commonly be found in a glitch were they are bouncing up and down rapidly on the spot, this could be due to bighorners spawning on each other.

Appearances
Bighorners appear in Fallout: New Vegas.