This example displays an animated hierarchical tree of animal classifications, from a root "Animals" node down to individual species like Horse and Canary. It uses d3.stratify() to structure the data and d3.tree() to compute the layout, with each generation assigned a distinct color. SVG circles and text labels represent nodes, while paths animate their drawing from parent to child over 1.5 seconds using transition(). The visualization is rendered with D3 v6 and uses a light pink background for the page.