The hippo is unable to survive in areas outside the National Park. The Nile monitor lizard Varanus niloticus is common within the park. Juvenile monitor lizards are restricted to riverbank habitats whilst older animals are found throughout the area. There were no apparent differences between lizards seen on either riverbank, although adults were more common on the Western bank. Diet of juveniles consists largely of orthopterans, spiders and beetles.
Adults eat large quantities of snails.
A survey of dragonflies conducted at several sites in Ghana recorded 71 species. These new species records included 12 new genera for Ghana. Forty six species of fish from 17 families were recorded from the Black Volta River. All are of economic importance. Four fishermen caught an average of 10.75 fish each day with a mean biomass of 3216g per day.