List of things unique to the Dr. Seuss universe
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Animals
- Bar-ba-loot: A furry creature that looks sort of like a bipedal bear and is about the size of a very small cat. They play in shady areas and eat sweet food. If they go too long without eating, they get gassy.
- Swomee Swan: An orange and yellow swan with a melodious call.
- Humming fish: A fish similar to a large goldfish which can hum. They can walk on their fins and breathe air but still need water, preferably non-polluted.
- Who: A small humanoid big enough to fit on speck of dust. They cannot be seen with the naked eye, but can occasionally be heard.
- Birthday bird: A large, talking bird whose job it is to host birthday parties.
- Glunk: A large creature that can speak and eats a certain type of stew. They are very hard to "un-thunk".
- Gox: A large, apelike creature who likes to box.
- Doubt Trout: A kind of fish.
- Beft: Large, birdlike creatures who always travel left.
- Zizzerzazzerzuzz: A large, pink and white creature.
- Fifferfefferfeff: A furry, bipedal creature with feathers on its head.
- Zed: A small, yellow, domesticated animal that walks upright and has a long, fast-growing hair upon its head.
- Zans: A deer-like creature.
- Klotz and Glotz: Both deer-like creatures, but they have black spots.
- Bifferbaum bird: A kind of bird that uses its nest only for sleeping and rebuilds it each night.
- Spotted atrocious: A very large creature that eats many things, including people.
- Sneetch: A large, yellow, birdlike creature that lives on the beach. Some, called the star-bellied sneetches, have green stars on their bellies, while the others, called plain-bellied sneetches, don't.
- Jibboo: A shadowy, birdlike humanoid.
- Tweetle-beetle: A kind of aggressive beetle.
- Snoo: A humanoid, moose-like creature.
- Pillow Snake: A snake that sits on a pillow.
- Wasket: A little pink creature.
- Vug: A large, possibly dangerous creature.
- Which-what-who: A creature with a human's head, legs, arms and body, a duck's feet, a spout on its head, antlers, a leopard's tail, and an elephant's trunk.
- Ikka, Gritch, Grickle, Wild Wheef and Nupper: All sapient creatures who like steak and dislike stew. You can tell them apart because Ikkas are short and green and yellow with wings but not birds, Gritches are a bit taller and orange and yellow and a bit like birds, Grickles are quite tall and purple, Nuppers are orange, spotty and walk on all fours and wild Wheef are green with long noses and blue hair.
Plants
- Truffula tree: A rare tree with brightly-coloured, silky tuft on top instead of leaves. The fruit is edible and looks like grapes.
- Pillberry vine: A vine that grows bad-tasting berries that add feathers to birds' tails.
- Grickle grass: A very hardy type of grass.
- Snide: A kind of grass-like plant that grows in "snide fields".
- Moose-moss: Moss that moose like to eat.
- Bippolo tree: A very rare tree. If somebody makes a wish before planting the seed, the tree will grow what was wished for.
- Zinniga-Zanniga Tree: A tree that produces pink flowers. The juice of the flowers allegedly has amazing healing properties, but it is unknown if that is true because it was said as part of a trick.
Places
- Whoville: A town where Whos live. They celebrate human traditions like Christmas (they even have their own Santa Claus) and put the word "Who" onto words.
- Katroo: A city that hosts very elaborate birthday parties.
- Na-nupp: A place that is supposedly on another planet as there are three moons. All the birds there are diurnal.
- Da-dake: Another place with only diurnal birds. There is a lot of water there.
- Thneedville: A town where everything is artificial. Not in the books, but it's in the movie of The Lorax
- The River Woo-Wall: A river that is considered aesthetically pleasing.
- Another one is the River Wah-Hoo.
- Roover River: Another river.
- The Waiting Place: A place where everybody waits.
- The Ocens of Olf: Part of the sea.
- Solla Sollew: An almost-perfectly utopian city.
- Boola Boo Ball: A perfectly utopian city.
Food and Drink
- Green Eggs and Ham: Just what it sounds like. To clarify, the ham is green too.
- Scrambled Eggs Super Dee Dooper Dee Booper Special Deluxe a la Peter T. Hooper: a kind of scrambled eggs made from the eggs of many different strange birds.
Vehicles
- Zike Bike: A wacky kind of bicycle.
- Crunk Car: A weird sort of car.
- Wubble: A type of animal-pulled vehicle.
Clothes
- Thneed: A thing knitted from the tufts of truffula trees that can be an article of clothing and many other things besides.
- Gruvulous Glove: A kind of glove that has a secret compartment.
Games
- Up, Up, Up with a Fish: Lifting up a fish tank in a weird way.
- Fun in a Box: Introducing two Things in a box.
Other
- Puzzler: A word for the brain.
- Pal-alace: A word for palace.
- Mustard-off pool: A swimming pool designed specifically for removing mustard.
- Sweeping-up-afterwards broom: A broom designed just for sweeping up a mess caused by a big event.
- Un-thinker: The part of the mind that can "un-thunk" things.
- Un-thunk: To imagine that something doesn't exist to the point of it no longer existing.
- Thinker-upper: The part of the mind that thinks things up.
- Mind-maker-upper: One who is good at making up their mind.
- Footsy: If someone is footsy, they use their feet a lot.
- Whisper-ma-phone: A horn tied to a hose meant for whispering through.
- Lurkem: An office to lurk in.
- Snuvv: The secret compartment in a gruvolous glove.
- Un-slump: To un-slump oneself is to get oneself out of a slump.
- Star-off Machine: A machine to remove stars from Sneetches' tummies.
- Blibber-blubber: Stuff that's hard to pronounce.
- Tweetle-beetle battle: A battle between tweetle-beetles.