Foldable: Use half of a letter size paper. Fold a four-tab foldable. In the cover tab, the students can write the words Feathers, Fur, Scales and Exoskeleton. Inside they sort the pictures and write.
Another option is the use of a whole page where the students can write a sentence about each cover.
I also offer:
ANIMAL CLASSIFICATION Booklet
ANIMAL CLASSIFICATION Activity and Center
ANIMAL ADAPTATION - 3 activities: Foldable, Web and Assessment
How Animals Move? Booklets