英文關鍵字
frog
treefrog
gray
hyla
versicolor
hylidae
call
sing
song
calling
singing
trill
trilling
night
nocturnal
male
mate
attract
attraction
reproduction
behavior
animal
nature
natural
creature
fauna
north
america
ohio
spring
sound
sounds
noise
noises
dark
darkness
brown
vegetation
green
grey
cattail
pond
wetland
environment
environmental
amphibian
wildlife
macro
amphibians