Visualizations are commonly used in educational materials, however not all visualizations are equally effective at promoting learning. Prior research has supported the idea that both perceptually rich and bland visualizations are beneficial for learning and generalization. We investigated whether the perceptual richness of a life cycle diagram influenced children's learning of metamorphosis, a concept that prior work suggests is difficult for people to generalize. Using identical materials, Study 1 (n = 76) examined learning and generalization of metamorphosis in first and second grade students and Study 2 (n = 53) did so in fourth and fifth grade students. Bayesian regressions revealed that first and second grade students learned more from the lesson with the perceptually rich diagram, while fourth and fifth grade students generalized more broadly with the bland diagram. The results from the fourth and fifth grade students are similar to prior research with adults. This suggests that the effect of perceptual richness on learning and generalization changes over development. [This paper was published in "Journal of Experimental Child Psychology" v213 Article 10526 2022.]