This tree chart visualizes the evolutionary relationships within the Equus asinus species network, starting from the ancestral Dinohippus node and branching into Horse, Donkey, and Zebra subgroups with their respective subspecies. The visualization uses D3.js v5 hierarchy and tree layout APIs to compute node positions, with SVG paths connecting parent and child nodes. Node styling reflects data attributes, where circle fill colors indicate the node's level, stroke colors denote node type, and link colors correspond to parent-child connections. The rendered SVG uses cubic Bézier curves for the tree branches, with each circle's radius scaled proportionally to its data value.