The gorillas are a pet project by Clayton Holdren in an attempt to recreate pre-War gorillas and hopefully other species. There are two specimens, and both are actually synths designed in the form of the Silverback gorilla. This is revealed upon talking to Clayton, who brings up the gorillas while introducing the Sole Survivor to Bioscience during Institutionalized.
Characteristics
Biology
They are synthetic gorillas, natural in appearance and realistic in behavior, but robotic at base level.
Gameplay attributes
The gorillas are largely passive to the player and wander around their terrarium. However, during A House Divided, their enclosure can be opened, where they will be hostile to everything, including the player character. This same occurrence can happen if the The Nuclear Option quests are carried out against the Institute. Also, placing an Institute beacon during Airship Down may spawn a couple of them to the player character's side. Upon breaking into the Bioscience division, the cage will then be opened and the gorillas will attempt to assist the synths in combating the Sole Survivor and whatever faction they chose to side with.
Variants
Gorilla
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A terminal in Bioscience states "What to create? We've engineered creatures that inhabit the sky and land- The next logical step is a creature of the sea." See "Bioscience Terminal 2D", "SZI Phase 2 development". This may mean we will see synthetic creatures inhabiting the ocean, in A DLC Or another fallout game.
With Wasteland Workshop installed, gorillas can be caught in a cage and then released to serve and protect the settlement. They are docile by default, boost the settlement's happiness rating simply by being there and add 10 points to the defense value (as much as a deathclaw). However, the player character must have completed The Nuclear Option (with any faction) and given the evacuation order to be able to build the cage.
