This adjacency matrix visualizes the social network of dolphins, showing connections between individual dolphins as blue cells on a white grid. The code fetches network data from a GitHub Gist, parses it, and builds a symmetric matrix since the graph is undirected. Using D3 v7, it renders the matrix as SVG rectangles with a tooltip, mapping each cell to a row and column representing dolphin IDs. The visualization highlights the network’s structure at a glance, with each filled cell indicating a social tie between two dolphins.