The Booklist below will allow you many opportunities to learn more about The Rainforest. These books along with the resources below would make a wonderful Rainforest Unit Study for your K-1 students.
This Rainforest Unit Study Resources pack is free and includes resources for Bible, Math and Language Arts. This Rainforest Pinterest Board has many more ideas to add to your study of the Rainforest. Choose a variety of projects and create a hands-on unit with Bible, reading, writing, math, geography and science!
The Umbrella by Jan Brett
Over in the Jungle, A Rainforest Rhyme by Marianne Berkes
Rainforests by Nancy Smiler Levinson
The Rainforest Grew All Around by Susan K. Mitchell
The Great Kapok Tree by Lynne Cherry
Nature's Green Umbrella by Gail Gibbons
About the Rainforest, We both Read by Heather Johanason
If I Ran the Rainforest by Bonnie Worth
A is for Anaconda, A Rainforest Alphabet by Anthony D. Fredricks
In the Rainforest, Let's Read and Find Out Science
(all images from Amazon.ca)