英文關鍵字
algae
amphibian
animal
aquatic
backgrounds
behavior
biology
bubble
change
color
conservation
defecating
dung
eating
environment
environmental
feces
freshwater
frog
green
growth
herbivorous
larva
life
living
metamorphosis
nature
new
object
organic
organism
outdoors
pebble
plant
pond
puddle
resting
rock
scene
springtime
stage
stone
stool
summer
surface
swimming
tadpole
tail
textured
toad
tranquil
tranquility
underwater
water
wildlife
young