I just found this when I went into the kitchen to clean after yet another round of Find the Nits in Fiona's hair (Day 3 and I'm still finding those little bastards).
This is why I pick out nits for hours on end. Well, one reason. Those red drawings are coral, by the way. They're studying coral at school, and we just watched Blue Planet: Seas of Life. They found it enthralling, especially the coral and the jellyfish.