Why is a monk-jack classed as vermin?

Muntjac deer, often referred to as "monk-jack," are classified as vermin in some regions due to their invasive nature and the damage they cause to local ecosystems, agriculture, and gardens. Their rapid reproduction rates and adaptability allow them to thrive in diverse environments, leading to overpopulation. This can result in significant competition with native species for resources and increased risks of vehicle collisions. Consequently, some governments implement control measures to manage their populations.