英文關鍵字
animals
avian
bird
birdwatching
carriers
center
city
close
closeup
crowding
danger
dangerous
dirty
disease
doves
downtown
eating
environment
feather
feed
flock
flu
food
garbage
group
health
hungry
hygiene
illness
infection
influenza
insanitary
park
peace
pecking
pigeons
pollution
poo
problem
public
sanitary
sickness
square
street
town
unhygienic
unsanitary
urban
waste