This streamgraph visualizes the mock mortality rates of three sea turtle species (Green, Loggerhead, Hawksbill) from 1901 to 2000, showing their combined decline over time. The stacked area chart uses d3.nest to group data by year and d3.stack to layer the species’ counts. Each species is distinguished by a color from a d3.scaleOrdinal palette, with the SVG paths generated using d3.area. Axes are scaled with d3.scaleLinear, and data is loaded from a CSV file via d3.csv.