This animated scatter plot displays measurements from three penguin species—Adelie, Chinstrap, and Gentoo—with each species represented by a distinct color. Every 2.5 seconds, the x-axis variable cycles through body weight, bill depth, flipper length, and bill length, while the y-axis remains fixed on bill length, reshaping the point positions accordingly. Built with D3 v6, the visualization uses SVG circles, `scaleLinear` for axes, and `setInterval` to drive the transition. Data comes from a CSV file fetched via D3’s `csv` function, with a custom legend and axis labels rendered in white against a black background.