Why is the global count of Chinese water deer figures likely inaccurate when aggregated?

Answer

It is heavily weighted by the well-documented introduced zones, minimizing the native count

Pinpointing an exact global total for the Chinese water deer is nearly impossible because the available data sources are vastly different and unequal in scope and reliability. The most robust and traceable statistics come from areas like the UK, where management practices yield large figures based on removals. When attempting to aggregate a global count, these substantial, documented figures from introduced zones tend to heavily skew the total, potentially obscuring or minimizing the true, often precarious and poorly quantified, number of deer remaining in their native Asian range.

Why is the global count of Chinese water deer figures likely inaccurate when aggregated?
populationanimaldeerChinawater deer