These are nouns for other breeds of bird.
What would work for marauding feral chickens on the island of Jersey?

aerie
ascension
band
bevy
bouquet
brace
brood
building
bury
cast
chain
charm
chattering
clamor
clutch
colony
company
congregation
conspirancy
convocation
cote
cover
covey
crèche
deceit
descent
dissimulation
dole
dule
episode
exaltation
fall
flight
flock
flush
gaggle
hedge
herd
host
huddle
kettle
lamentation
mob
murder
murmuration
muster
mustering
nest
nide
nye
ostentation
pack
paddling
parcel
parliament
party
peep
piteousness
pitying
plump
raft
rafter
rookery
scold
sedge
siege
skein
sord
spring
storytelling
team
tidings
unkindness
volery
wake
walk
watch
wedge
wing
wisdom
wisp