This interactive tree diagram shows a simple biological classification of snakes into two families—Cobra and Colubrid—with three species beneath each. The visualization uses D3.js layout and SVG rendering to draw collapsible nodes and yellow links. Users can click a node to expand or collapse its children, with smooth transitions animating the repositioning of elements. The code defines the tree structure in raw JavaScript and uses the D3 `diagonal` projection to create the connecting paths.