Instead of adding a creature model to GTA IV, Rockstar created a user profile named 'Chupacabra' on the in-game website Liesdamnlies.net, with Liberty City as the location. The account leaves creepy comments referencing occult sacrifices and being sighted by homeless people, mirroring actual Chupacabra folklore.
Source: Chupacabra (GTA IV) — CC BY-SA
That question mark? Pretty much sums up the GTA IV Chupacabra — you never see the thing, but its creepy Liesdamnlies.net profile is out there leaving comments about occult sacrifices and homeless sightings.
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