This scatter plot visualizes the relationship between flipper length and body mass for three penguin species from the `penguin_data.csv` file. Each circle is colored by species, distinguishing Adelie, Gentoo, and Chinstrap penguins. The chart uses D3 v5 with SVG rendering, employing `d3.scaleLinear` for axes and `d3.axisLeft`/`d3.axisBottom` for tick marks. The code also records bill dimensions as non-visual data attributes (`rx`, `ry`) on each circle, though these do not affect the plotted points. Axis labels and a title are included.