The tricranosloth is a large alien seen in MiB headquarters. It is unknown if this alien is sentient for sure as it only appears as a corpse in Men in Black II. The face of the tricranosloth is never shown as it's tentacles covered its face the whole time (assuming it has a face at all). The tricranosloth was going through passport control when Agent J entered the scene. Although the cause of death for this tricranosloth are unknown it was possibly the result of some alien crime or incident as an MiB Autopsy Agent took responsibility for the incident. The tricranosloth is similar to a Squid although it is unlikely that the two species are in any way related. Later in the film Frank uses the corpse to hide from Serlina who has taken over MiB headquarters using its complex interweaving of tentacles as a hiding spot.