At 52 square miles, Christmas Island isn't terribly large either. And, given that shrews have a lifetime of perhaps a year or two and there's been no sightings

At 52 square miles, Christmas Island isn't terribly large either. And, given that shrews have a lifetime of perhaps a year or two and there's been no sightings in 40+ years, it seems unlikely that a stable breeding population has survived unnoticed.