Question 1

What reading level is the 21st Century Junior Library: Which is Which? series?

Accepted Answer

The 21st Century Junior Library: Which is Which? series by Tamra Orr is at a Grades 3.6–3.9 reading level (average Grade 3.8). Intended for Lower Grades (Ages 5–8). There are 8 books in the series.

Question 2

What order should I read the 21st Century Junior Library: Which is Which? books?

Accepted Answer

The 21st Century Junior Library: Which is Which? series has 8 books in order: 1. Aardvark or Anteater, 2. Alpaca or Llama, 3. Butterfly or Moth, 4. Crocodile or Alligator, 5. Frog or Toad, and 3 more.

Question 3

What age is the 21st Century Junior Library: Which is Which? series appropriate for?

Accepted Answer

The 21st Century Junior Library: Which is Which? series is recommended for Lower Grades (Ages 5–8). The average content intensity is 1/5.

#	Title	Reading Level	Content
1	Aardvark or Anteater Tamra Orr	Level 3-4	Gentle
2	Alpaca or Llama Tamra Orr	Level 3-4	Gentle
3	Butterfly or Moth Tamra Orr	Level 3-4	Gentle
4	Crocodile or Alligator Tamra Orr	Level 3-4	Gentle
5	Frog or Toad Tamra Orr	Level 3-4	Gentle
6	Porpoise or Dolphin Tamra Orr	Level 3-4	Gentle
7	Seal or Sea Lion Tamra Orr	Level 3-4	Gentle
8	Wasp or Bee Tamra Orr	Level 3-4	Gentle

21st Century Junior Library: Which is Which? Books in Order

Content Intensity Across the Series

21st Century Junior Library: Which is Which? Reading Order

All 21st Century Junior Library: Which is Which? Books

Aardvark or Anteater

Alpaca or Llama

Butterfly or Moth

Crocodile or Alligator

Frog or Toad

Porpoise or Dolphin

Seal or Sea Lion

Wasp or Bee