This mod adds in Super Mutant Behemoth Spawns and makes them able to respawn. They will spawn either alongside centaurs (standalone version) or randomly in the wasteland (other versions), they currently do not spawn alongside super mutants due to possible issues spawning indoors (this will hopefully change later). They also currently use the fallout 3 textures (this will hopefully be changed to the new vegas one in the future). They will spawn at level 20, existing ones (with other mods) will respawn and can still be encountered at level 1. 

Required Files (Temporary):

All Versions:

Behemoth Textures: 
https://www.nexusmods.com/newvegas/mods/46573/
Credits: oblivionfallout4eva

(Certain Versions Only):

Either:

Random Encounters: 
https://www.nexusmods.com/newvegas/mods/42793
Credits: Darkfirebird

or

Mojave Wildlife:
https://www.nexusmods.com/newvegas/mods/64638
Credits: PushTheWinButton