英文關鍵字
africa
african
animal
aquatic
bathing
big
captive
choeropsis
cute
danger
dangerous
endangered
environment
eyes
fauna
forest
head
herbivore
hexaprotodon
hippo
hippopotami
hippopotamid
hippopotamidae
hippopotaminae
hippopotamus
lake
liberia
liberiensis
looking
mammal
motion
park
protected
pygmy
reserve
river
safari
semiaquatic
slow
slowmo
submerged
swamp
swimming
view
water
wild
wildlife
zoo
zoological