英文關鍵字
ancient
animal
area
aspen
autumn
beaver
beavers
behavior
bionomics
bites
centenary
colony
dam
ecology
environment
fall
fallen
fat
feeding
fell
flight
flooding
forest
forestry
gnaw
gnawed
gnawer
going
grounds
house
lodge
naturalization
nibble
old
owner
park
pond
rodentn
settlement
surrounding
thick
timber
tree
wild
wood
woodland
working