英文關鍵字
ancient
animal
animation
arthropod
arthropods
background
bottom
cambrian
chasing
claws
compound
creature
devonian
era
eurypterid
eurypterus
exoskeleton
extinct
eyes
form
fossil
illustration
insect
known
large
life
marine
million
moving
nature
ocean
ordovician
painting
paleontology
period
permian
pincers
prehistoric
remipes
science
scorpion
sea
seafloor
swimming
triassic
trilobita
trilobite
trilobites
underwater
wildlife
years
zoology