This visualization shows the relationship between bill depth and bill length in the Palmer Penguins dataset, with each point shaped according to penguin species. The scatter plot uses D3.js v7 with modular components for axes, legends, and symbol generation, assigning circles, squares, and diamonds to distinguish species. Data is loaded asynchronously via `fetch` and parsed with `csvParse`, then mapped through `scaleLinear` and `scaleOrdinal` scales. A custom shape legend displays the species mapping alongside the plot.