3.1.1 Warthog numbers from distance sampling and habitat preference
Using the Distance software, data for the years, 2013-2018 were analysed. The years 2013 and 2018 produced interpretable results. The estimation of the number of warthogs in NGR were n =632, 95% confidence interval=[490,815]95% and n =383, CI=[271, 541]95% respectively. This suggests a population ranging between 400 and 500 warthogs , i.e. 3-5 individuals/km2 in NGR. Table 2 shows the raw counts of warthogs along the transects for each year. Warthogs had a significant preference for water areas compared to other vegetation types (1-way ANOVA P= 0.002).