Down in the deepest, And darkest of depths, As deep and as dark, As dark and deep gets There lives a species, Of unspeakable size, With paws with claws, And pie sized eyes. Get ready to meet a family of cats that are unlikely and cat you could have ever imagined. The Sir Rhymesalot reading level (lexile) is age 11 - 14 (grade 4 - 6) but parents reading these books to children aged 3 - 7 (K - 2) can strengthen literacy and vocabulary significantly in their young minds. This is due to the power of rhyme as a literacy builder.