This interactive visualization presents a hierarchical classification of animals as a branching tree. Built with D3.js v3, it uses an SVG-based layout with collapsible nodes, colored rectangles, and directional links to illustrate relationships between categories like vertebrates and non-vertebrates. The tree reads from a JSON data file and supports zoom and drag navigation via `d3.behavior.zoom`. Node colors correspond to taxonomic levels, while tooltips and click interactions reveal additional details about each group.