This area chart displays the average body mass of different penguin species, using red data points over a light blue filled area. The visualization is built with D3 v7 and rendered as an SVG, pulling data from a remote TSV file. It computes averages per species using D3’s `scalePoint` and `scaleLinear` for axes, while an interactive tooltip appears on hover via `d3.select` and mouse events, enhancing data exploration.