This interactive visualization displays a classification tree of mammals, branching from the class Mammalia into orders like Carnivora and Artiodactyla, then to families and specific species such as the gray wolf and domestic cow. The tree uses collapsible nodes and animated transitions, with users able to click to expand or contract branches. Built with React, the code leverages D3.js alongside SVG elements to render the hierarchy, with styling applied through CSS. The layout is computed using D3’s tree layout and diagonal projection functions, and animations are driven by D3’s transition mechanisms.