Fold 1
- Ages
- 4–6
- Reading grade
- Pre-K–K
- Stage
- First Reader
- Book
- 6 × 9 in, 24 pp
- Words
- 109
- Words a sentence
- 3.3
- Longest sentence
- 7 words
- Flesch–Kincaid grade
- -2.5
For educators
Six books on one animal, from a child's first book to read alone to popular science for adults. A class can study the same facts with every reader in a book they can manage.
The reading ladder
Measured on each book's reader-facing text with the Flesch–Kincaid formula, the same count the books are checked against before print.
| Measure | Fold 1 | Fold 2 | Fold 3 | Fold 4 | Fold 5 | Fold 6 |
|---|---|---|---|---|---|---|
| Ages | 4–6 | 6–8 | 8–10 | 10–12 | 12+ | 12+ |
| Reading grade | Pre-K–K | K–2 | 1–2 | 2–4 | 4–7 | not graded |
| Stage | First Reader | Read Together | Early Reader | Explorer | Field Guide | Deep Dive |
| Book | 6 × 9 in, 24 pp | 8.5 × 8.5 in, 32 pp | 6 × 9 in, 32 pp | 8 × 10 in, 40 pp | 8 × 10 in, 48 pp | 6 × 9 in, 58 pp |
| Words | 109 | 255 | 524 | 2,138 | 5,159 | 7,169 |
| Words a sentence | 3.3 | 4.9 | 6.7 | 9 | 12.3 | 20 |
| Longest sentence | 7 words | 12 words | 10 words | 20 words | 29 words | 44 words |
| Flesch–Kincaid grade | -2.5 | -0.1 read aloud | -0.5 | 2.8 | 4.9 | 9.6 |
Fold 2
- Ages
- 6–8
- Reading grade
- K–2
- Stage
- Read Together
- Book
- 8.5 × 8.5 in, 32 pp
- Words
- 255
- Words a sentence
- 4.9
- Longest sentence
- 12 words
- Flesch–Kincaid grade
- -0.1 read aloud
Fold 3
- Ages
- 8–10
- Reading grade
- 1–2
- Stage
- Early Reader
- Book
- 6 × 9 in, 32 pp
- Words
- 524
- Words a sentence
- 6.7
- Longest sentence
- 10 words
- Flesch–Kincaid grade
- -0.5
Fold 4
- Ages
- 10–12
- Reading grade
- 2–4
- Stage
- Explorer
- Book
- 8 × 10 in, 40 pp
- Words
- 2,138
- Words a sentence
- 9
- Longest sentence
- 20 words
- Flesch–Kincaid grade
- 2.8
Fold 5
- Ages
- 12+
- Reading grade
- 4–7
- Stage
- Field Guide
- Book
- 8 × 10 in, 48 pp
- Words
- 5,159
- Words a sentence
- 12.3
- Longest sentence
- 29 words
- Flesch–Kincaid grade
- 4.9
Fold 6
- Ages
- 12+
- Reading grade
- not graded
- Stage
- Deep Dive
- Book
- 6 × 9 in, 58 pp
- Words
- 7,169
- Words a sentence
- 20
- Longest sentence
- 44 words
- Flesch–Kincaid grade
- 9.6
Using the set with mixed readers
Start everyone on one fact
Open the ladder on the board and pick a fact. Each fold tells the same fact in its own words, so the whole class can talk about it together, whatever they are reading.
Hand out by fold, not by name
Children choose the fold that fits them this week and move up when they are ready. Because the facts match, a group reading different folds can still compare notes.
Climb one rung
A confident reader reads a fact in their own fold, then the next fold up, and tells a partner what the deeper version adds.
Let the youngest listen
Where narration is available, Read to me lights each sentence as it is spoken. It suits pre-readers and children new to English.
Trace a sentence to its source
Older students pick a sentence, find its fact in the fact bank and open the source behind it. It is a short lesson in checking what you read.
Fold by fold
Go, Cat, Go!
Fold 1 · First Reader · Ages 4–6
What it is for
The cat in this book is a Maine Coon, the big, shaggy farm cat of Maine. Its breed name is not yet decodable for a beginning reader, so the text calls it the cat; say the name Maine Coon together as you read. Teach the four Story Words with their pictures first: fur, tail, toes and chirp. Every other word on the reading pages uses sounds taught through UFLI Lesson 41 or a Heart Word. The notes at the back name the breed and say what a Maine Coon can do and what only some have. The last pages model a kind hello: sit still and let a cat come to you.
Talk about it
Questions the book asks its reader:
- Who is big?
Words
- fur
- cat coat
- tail
- cat's back end
- toes
- paw parts
- chirp
- cat sound
Hello, Maine Coon!
Fold 2 · Read Together · Ages 6–8
What it is for
Read aloud and pause so your child can join the bold sound words and answer the questions; they are invitations, not a test. Maine Coon (say “main koon”) is a domestic cat breed. The book follows six surprises: a giant cat that keeps growing, a coat like snow pants, a tail like a scarf, mitten toes, a liking for water, and chirps. It ends with how to say hello: sit still, speak softly and let the cat come. Supervise every meeting with a real cat. For a child reading alone, try Fold 1, Go, Cat, Go!, then Fold 3, Maine Coon: A Cat With a Shaggy Coat.
Talk about it
Questions the book asks its reader:
- Shall we meet a giant cat?
- Can you find six surprises?
- Mrrp?
- How do you say hello to a cat?
- Can you stretch up tall?
- Are you still growing too?
Words
This fold has no glossary or word list.
Maine Coon: A Cat With a Shaggy Coat
Fold 3 · Early Reader · Ages 8–10
What it is for
Read page 3's pictured words together first: snow, Maine and Coon (Maine Coon is the breed). Each is bold at first use. Most words sound out with first-grade phonics; read coat, shaggy, belly, short, tail, scarf, born, paws, chirp and shower for your child. Page 30 has a quiz with answers. A crate here is a familiar carrier with the cat's own bedding. Never put a cat in water; let a cat start and end contact; put string toys away. Before this: Fold 1, Go, Cat, Go!; next: Fold 4, Maine Coon: A Life of Fur and Play.
Talk about it
From the book's quiz:
- How does long belly fluff help in snow?
- How can a tail be like a scarf?
- What makes some paws look like mittens?
- What makes a crate a safe spot?
- A Maine Coon chirps at you. What can you do?
Words
- snow
- cold, white flakes
- Maine
- a snowy state
- Coon
- Maine Coon: a big cat breed
Maine Coon: A Life of Fur and Play
Fold 4 · Explorer · Ages 10–12
What it is for
Fold 4 is for readers of about 10 to 12 who read on their own. Each chapter opens with a big picture and a question, then mixes short text with Wow! boxes and questions from Mila and Omar. The quiz is on page 36, the glossary on page 37, How We Know on page 38 and the sources on page 39. Help with polydactyly (pol-ee-DAK-tuh-lee) if needed. Children should meet cats with an adult nearby, let a cat approach and leave freely, and never put a cat into water. A veterinarian is the right guide for a real cat's health. For an easier read, try Fold 3, Maine Coon: A Cat With a Shaggy Coat. For more depth, try Fold 5, Maine Coons: A Field Guide to the Breed.
Talk about it
From the book's quiz:
- How big can a Maine Coon get?
- Where does a Maine Coon's coat grow longest?
- What can a Maine Coon do with its tail when it sleeps?
- Do all Maine Coons have extra toes?
- What might a water-loving Maine Coon do?
- Maine Coons often chirp. What should you do if one chirps at you?
Words
- breeding line
- A cat family that breeders raise, from parents to kittens.
- down hairs
- Soft, fine hairs close to a cat's skin that trap warm air.
- guard hairs
- Longer outer hairs that lie over the down hairs.
- perch
- A raised resting spot where a cat can watch its world.
- polydactyly
- Having extra toes, as some Maine Coons do.
- slow blink
- A long, gentle close of the eyes. Cats in the study often narrowed their eyes back.
- trill
- A rolling, bubbly sound a cat can make.
- water-resistant
- Able to keep out some water. A water-resistant coat helps, but it is not waterproof.
Maine Coons: A Field Guide to the Breed
Fold 5 · Field Guide · Ages 12+
What it is for
This field guide is for readers 12 and up. Read a chapter together, then talk through the field notes, Scientist spotlights and Try it boxes. Chapter 9 shows how to watch a cat without disturbing it; please supervise any watch of a real cat. Chapter 10 covers HCM and SMA and is best read together: it explains what tests and scans show, not how to diagnose or treat a cat. The glossary is on pages 43–44 and the index on page 45. For a gentler start, try Fold 4, Maine Coon: A Life of Fur and Play; to go further, read Fold 6, Maine Coons, Unfolded.
Talk about it
Questions the book asks its reader:
- Which of these eight features would you most like to see for yourself, and where would you look?
- Will you look closely with me before we decide what anything means?
- Will you ask with me how sure each claim is?
- Could you estimate a cat's age from its size alone, or would you need other information?
- Which words in a breed standard describe shape, and which describe size?
- Why would fur keep a cat warm at all?
Words
- Breed standard
- A written description of a breed's ideal look, used by judges at cat shows.
- Britches
- The long fur on the back of a cat's hind legs, which helps protect against wet and snow.
- Domestic cat
- A cat that lives with people, not a wild species. Maine Coons are domestic cats.
- Echocardiography
- An ultrasound scan that uses sound waves to make images of the heart.
- Field mark
- A feature that helps you recognize an animal by sight.
- HCM
- Hypertrophic cardiomyopathy, a heart condition in which the muscle walls thicken.
- Incomplete penetrance
- When some animals carry a gene version without showing its trait.
- Maturation
- Growing into an adult body. The breed standard allows for slow maturation in Maine Coons.
- Motor neuron
- A nerve cell that controls muscles.
- Muzzle
- The part of the face around the nose and mouth.
- Obligate carnivore
- An animal that depends on nutrients found in animal foods.
- Papillae
- Tiny backward-facing spines on a cat's tongue.
Maine Coons, Unfolded: The Science of a Remarkable Cat
Fold 6 · Deep Dive · Ages 12+
What it is for
For teenagers and adults. Each of the first chapters follows one of the six surprises in the Maine Coon episode, the same six told more simply in Go, Cat, Go!, Hello, Maine Coon!, Maine Coon: A Cat With a Shaggy Coat, Maine Coon: A Life of Fur and Play and Maine Coons: A Field Guide to the Breed. The evidence is named as it is used: breed standards, breed-club and State of Maine descriptions, and peer-reviewed studies of long hair, tabby pattern, polydactyly, activity rhythms, name recognition, slow blinks, and the A31P and SMA variants. The heart and nerve chapter explains what tests and studies measure; it cannot diagnose a cat, and questions about a particular cat's health belong with a veterinarian. AI writing tools assisted drafting and editing; illustrations are AI-generated interpretations, not photographs or veterinary imaging.
Talk about it
Questions the book asks its reader:
- How big is giant, and who says so?
- What about a coat keeps snow out, and which genes make the hair long in the first place?
- Why would a breed with extra toes running through its family lines still ask for the usual number at a cat show?
- What have researchers actually tested about the way cats listen, look and answer back?
- Why should fur keep anything warm at all?
- If cats do not keep a fixed schedule, when are they active?
Words
This fold has no glossary or word list.