I am trying to identify the name of a science fiction book I read in the mid-1990s.
The plot loosely revolves around future humanity having spread or migrated to vast space city habitats. Very athletic humanoid creatures have been bred or created with hyper-violent temperaments. They have the ability to keep their composure most of the time, except for their periodic need to flex where they will go on violent killing sprees - much to the alarm of everyone involved.
What I remember is that the story is told from the point of view of one of these creatures and involves a lot of hopping between different space cities and ensuing adventures.
Would anyone have any idea what book this may be?