Kemonozume, Kiseijuu: Sei no Kakuritsu Recommendations
Both anime involve a species that eats humans to live and both anime concentrate on understanding how the two species may co-exist.
Both series have monstrous creatures that devour human beings to survive.
Both have a protagonist who has to find a way to either live with or eradicate these monsters.
Both are incredibly good psychological series in different aspects.
Both worth the watch.