英文關鍵字
martin
perch
adult
protective
group
synanthropic
swallow
passerine
nesting
day
gourd
rack
birdhouses
nest
outdoors
bunch
house
bird
backyard
wildlife
birdhouse
animal
purple
garden
flight
fly
flock
英文關鍵字
martin
perch
adult
protective
group
synanthropic
swallow
passerine
nesting
day
gourd
rack
birdhouses
nest
outdoors
bunch
house
bird
backyard
wildlife
birdhouse
animal
purple
garden
flight
fly
flock