A Step 2 Step into Reading Science Reader about reptiles. PBS's successful animated show Wild Kratts follows the adventures of zoologists Chris and Martin Kratt as they travel to animal habitats around the globe. Along the way, they encounter incredible creatures while combining science education with fun. Boys and girls ages 4 to 6 can join the Kratt brothers as they activate their Creature Power Suits to creep, crawl, and slither with amazing reptiles! Step 2 Readers use basic vocabulary and short sentences to tell simple stories. For children who recognize familiar words and can sound out new words with help.