In an alternate 2014 timeline, an alternate Thanos became aware of the main universe and used reverse-engineered Pym Particles to travel through the Quantum Realm, bringing his weaponry and his allies to that universe, including the Chitauri Gorillas.
Shortly, the Chitauri Gorillas were brought down by Chitauri soldiers to the ruins of the Avengers Compound and participated in the battle against the Avengers, Guardians of the Galaxy, Ravagers, Asgardians, the Wakandan army, and the Masters of the Mystic Arts. During the battle, Mantis put one Gorilla to sleep using her powers. As one Gorilla charged after Hawkeye, it was confronted by Falcon who killed it. Another was killed by Valkyrie. The remaining Gorillas disintegrated after Iron Man used the Infinity Stones to end the battle.
The Chitauri Gorillas, as their name suggests, are large alien beasts whose posture and gait resembled that of a gorilla. They have 4 fingers on each of their hands, while their feet have 3 toes. Much like the other Chitauri forces, their bodies have been outfitted with cybernetic implants and armor plating. Some of the armor appears to cover their mouths and obscures their faces. As such, lights on their faces function as their eyes, which shut off after their death.
The Chitauri Gorillas function as military animals for the Chitauri. Despite their large sizes and strength, they seem to be completely subservient to them, seeing as they allow themselves to be leashed by chains.