africa
amphibius
animal
aquatic
artiodactyl
australia
bull
cow
fauna
freshwater
gregarious
head
heavy
herbivore
herbivorous
herd
hippo
hippopotamus
huge
mammal
megafauna
mouth
native
nature
place
sahara
saharan
south
species
sub
submerge
subsaharan
surface
swim
tanzania
teeth
torso
vulnerable
walk
wallow
water
wild
wildlife
zoo