One brush tailed possum can browse as much pasture as 0.06 sheep which may indicate why this "arboreal" animal has a visual streak: some comments on the "terrain" theory.
D000818:Animals; D005247:Feeding Behavior; D009474:Neurons; D009893:Opossums / Q000033:anatomy & histology*; D012160:Retina / Q000033:anatomy & histology* / Q000502:physiology; D014794:Visual Fields