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monarch
butterflies
monarchs
many
thousands
million
group
large
sleeping
butterfly
cluster
roost
hanging
flapping
wing
wings
fluttering
shivering
tree
side
branch
leaves
shiver
flutter
yellow
orange
black
white
dots
antenna
antennas
beautiful
natural
mexico
biosphere
reserve
protected
endangered
species
threatened
michoacan
area
still
hang
sleep