So I looked up name of groups of animals. Here a list to get your ideas going. Based on what I see, you have a “Drove of Burros”. Frankly I vote for a “Comfort of Burros”.
ANIMAL - GROUP NAME
Albatross - Rookery
Alligators - Congregation
Apes - Shrewdness
Antelope - Herd
Ants - Colony, Army, Swarm
Asses - Pace
Auks - Colony, Flock, Raft
Baboons - Troop, Flange
Bacteria - Culture
Badgers - Cete, Colony, Set, Company
Barracudas -
Battery
Bats - Colony,
Cloud
Bass - Shoal
Bears (General) - Sloth, Sleuth
Bears (Cubs) - Litter
Beavers - Colony
Bees - Grist, Hive, Swarm
Birds (Chicks) - Brood, Clutch
Birds (Flight) - Flight
Birds (Game) - Volary, Brace, Plump, Knob
Birds (Ground) - Flock, Dissimulation
Birds (Sea) - Wreck
Bison - Herd
Bitterns - Sedge, Seige
Bloodhounds - Sute
Bobolinks - Chain
Buffalo - Herd
Bullfinches - Bellowing
Bullocks - Drove
Butterflies - Flight, Flutter, (Many more)
Buzzards - Wake
Camels - Caravan, Train
Caribou - Herd
Caterpillars - Army
Cats (General) - Clowder, Clutter, Pounce, Dout, Nuisance, Glorying
Cats (Kittens) - Kindle, Litter, Intrigue
Cats (Wild) - Destruction
Cattle - Drove, Herd, Team
Chickens (General) - Brood, Peep
Chickens (Chicks) - Clutch, Chattering
Chinchilla - Colony
Clams - Bed
Cobras - Quiver
Cockroaches - Intrusion
Cod - Lap
Coots - Cover
Cormorants - Gulp
Cows - Kine
Coyotes - Band
Crabs - Cast
Cranes - Sedge, Seige
Crocodiles - Bask, Float
Crows - Murder, Horde, Parcel
Curlews - Herd
Deer (General) - Herd, Leash, Gang
Deer (Buck) - Brace, Clash
Deer (Roe) - Bevy
Dogs (General) - Kennel
Dogs (Curs) - Cowardice
Dogs (Hounds) - Cry, Mute, Pack
Dogs (Puppies) - Litter
Dogs (Wild) - Pack
Dolphins - Pod
Donkeys - Drove, Pace
Dotterel - Trip
Doves (General) - Dule, Bevy, Cote, Dole, Paddling
Doves (Turtle) - Pitying, Piteousness
Ducks (Flight) - Flock
Ducks (Ground) - Brace, badling
Ducks (Water) - Raft, Team, Paddling
Eagles - Convocation
Eels - Swarm, Bed, Fry
Elephants - Herd, Memory
Elk - Gang
Emus - Mob
Ferrets - Business, Cast, Fesnying
Finches - Charm
Fish (General) - Draft, Nest, Shoal, School ("school" is possibly a corruption of shoal)
Fish (Caught) - Catch, Drought, Haul
Flamingos - Stand
Flies - Business, Swarm
Frogs - Army, Colony
Fox - Leash, Skulk, Earth, Lead
Geese (General) - Flock
Geese (Flight) - Skein
Geese (Ground) - Gaggle
Giraffes - Tower
Gnats -
Cloud, Horde, Swarm
Gnus - Implausibility
Goats - Tribe, Trip, Drove
Goldfish - Glint, Troubling
Gorillas - Band
Grasshoppers -
Cloud
Greyhounds - Leash
Grouse - Pack
Gulls - Colony
Hawks (General) - Cast
Hawks (Flight) - Kettle
Hawks (Spiraling) - Boil
Hedgehogs - Array
Herons - Sedge, Siege, Hedge
Herring - Army
Hippopotamuses - Bloat
Hornets - Nest, Bike
Horses (General) - Team, Harras, Stable, Troop, Stud (a group belonging to one owner)
Horses (Colts) - Rag, Rake
Horses (Ponies) - String
Horses (Wild) - Herd
Hyenas - Cackle
Impalas - Herd
Insects - Horde, Nest, Swarm, Rabble, Plague
Jays - Party, Scold
Jellyfish - Smack
Kangaroos - Troop, Mob
Lapwings - Deceit
Larks - Exaltation, Ascension
Leopards - Leap
Lice - Flock
Lions - Pride, Sault, Troop
Lizards - Lounge
Locusts - Plague
Magpies - Tiding, Gulp, Murder, Charm
Mallards (General) - Brace
Mallards (Flight) - Sord
Martens - Richness
Midges - Bite
Minnows - Shoal, Steam, Swarm
Moles - Labor, Company, Movement
Monkeys - Troop, Barrel, Carload, Tribe
Moose - Herd
Mosquitoes - Scourge
Mules - Pack, Span, Barren, Rake
Nightingales - Watch
Otters - Romp, Bevy, Family
Owls - Parliament, Stare
Oxen - Team, Yoke, Drove
Oysters - Bed
Parrots - Company
Partridge - Covey, Pandemonium
Peacocks - Muster, Ostentation
Pekingese - Pomp
Pelicans - Pod
Penguins - Colony, Rookery
Pheasants (General) - Nest, Nye
Pheasants (Brood) - Nide
Pheasants (Take-Off) - Bouquet
Pigeons - Flight, Flock, Kit
Pigs (General) - Drift, Drove
Pigs (Boars) - Singular, Sounder
Pigs (Hogs) - Team, Passel, Drift, Parcel
Pigs (Piglets) - Litter, Farrow
Pigs (Swine) - Sounder
Pilchards - Shoal
Plovers (General) - Congregation
Plovers (Flight) - Wing
Polecats - Chine
Porcupines - Prickle
Porpoises - Herd, Pod
Prairie Dogs - Coterie
Ptarmigans - Covey
Quail - Bevy, Covey
Rabbits (General) - Colony, Warren, Bury, Trace, Trip
Rabbits (Domestic) - Herd
Rabbits (Hares) - Down, Husk
Rabbits (Young) - Litter, Nest
Raccoons - Gaze
Rats - Colony, Pack, Plague, Swarm
Rattlesnakes - Rhumba
Ravens - Unkindness
Reindeer - Herd
Rhinoceroses - Crash, Stubbornness
Roebucks - Bevy
Rooks - Building, Clamor
Salmon - Run
Sardines - Family
Scorpions - Bed, Nest
Seals - Pod, Bob, Harem
Sharks - Shiver
Sheep - Drove, Flock, Down, Hurtle, Fold
Squirrels - Dray, Scurry
Snails - Escargatoire, Rout, Walk
Snakes - Den, Nest, Pit
Snipe - Walk, Wisp
Sparrows - Host
Spiders - Cluster, Clutter
Springbok - Herd
Squirrels - Dray, Scurry
Starlings - Murmuration
Stoats - Pack, Trip
Storks - Mustering
Swallows - Flight, Gulp
Swans (General) - Bevy
Swans (Flight) - Wedge
Swifts - Flock
Teal - Spring
Termites - Colony, Nest, Swarm, Brood
Thrush - Mutation
Tigers - Streak, Ambush
Toads - Knot, Knab
Trout - Hover
Turkeys - Rafter, Gang, Posse
Turtles - Bale, Nest, Turn, Dole
Vipers - Generation, Nest
Walruses - Herd, Pod
Wasps - Nest, Swarm
Whales - Pod, Gam
Widgeons - Company
Wolves (General) - Pack
Wolves (Moving) - Route, Rout
Wombats - Wisdom
Woodcocks -
Fall
Woodpeckers - Descent
Worms - Bed, Clew, Bunch, Clat
Wrens - Herd
Zebras - Crossing, Zeal, Cohorts