sentences:  The IUCN Red List lists the species as fitting the "D2" criteria of the Vulnerable (VU) category in the "1994 Categories & Criteria", meaning the population has an acute restriction in its area of occupancy (typically less than 100 km2) or in the number of locations (typically less than five).As such, the population is prone to the effects of human activities, or chance events and may become critically endangered or may even become extinct very suddenly.The last assessment of its extinction risk was published by the World Conservation Union (IUCN) in 1996.