This area chart displays the Palmer Penguins dataset, showing culmen depth as a filled area across culmen length for each species. Three overlapping, semi-transparent colored areas represent the species distributions. The code loads CSV data via `d3.csv`, groups by species using `d3.group`, and renders areas with `d3.area` and `curveBasis`. Axes are drawn using `d3.axisBottom` and `d3.axisLeft`, with scales from `d3.scaleLinear` and colors from `d3.scaleOrdinal`.