This interactive tree diagram visualizes animal species classification, showing the hierarchical relationships from "Animals" down to specific groups like mammals, birds, insects, and sponges. The visualization encodes each node with a distinct color based on its taxonomic level, and supports zooming and panning to explore the full structure. The tree layout is computed using a custom `d3.layout.tree()` algorithm, with data loaded from a JSON file and rendered as an SVG using D3.js v3, including tooltips and animated transitions for node expansion.