By Maren Schmidt, Author of Understanding Montessori

Most ten-year-olds can tell you the stages of development for a butterfly or a frog. A butterfly begins as an egg, becoming a larva, a caterpillar, then a chrysalis emerging into a butterfly. A frog starts as an egg, hatching into a tadpole, turning into a polliwog, at last transforming into an adult frog. At each stage of change the frog and butterfly have differing needs for nourishment and environment.