From Creatures Wikia
- is more intelligent than the Bulbous Grendel - not susceptible to OHSS
- is virtually immune to heavy metal poisoning caused by radioactivity in the volcano
- can be longer-lived, given the right circumstances.
- has the personality of a bully - it likes beating norns up but runs away if you give it a few slaps
- can be made breedable
- can dance (when appropriate)
Another name for the Boney Grendel was the Grenzel.