Dr Chana added that in Ruaha - Rungwa ecological system buffalo population has increased by 80 per cent, zebra 36 per cent and antelope 65 per cent compared to the census conducted in 2018. "The black rhino which are among the endangered species have increased by 27.5 per cent compared to their population in 2018," Dr Chana said. "The increase in wildlife population is an indication of strengthened security and management of conserved ar- eas," she added. The minister said that the achievements have been also contributed by the government efforts to conduct patrols which have enabled the arrest of 7,719 suspects and recovery of government trophies.