A force-directed network graph visualizes the "weights of nodes" in an animal network. The visualization uses a CSV of animal pairs to define the links and nodes, with the simulation driven by `d3.forceSimulation` applying link, many-body, collision, and center forces. The graph is rendered as an SVG, with pink circular nodes and red strokes; node labels are purple. The `d3.drag` API enables interactive node dragging, while a green page background and a custom marker definition for arrowheads are also applied.