This visualization displays stacked bar charts comparing petal length measurements across three iris flower species (setosa, versicolor, and virginica) using the Iris dataset. The chart uses d3.stack() to create stacked segments, d3.scaleBand for the categorical species axis, and d3.scaleLinear for the numerical length axis. Colors distinguish each species through a d3.scaleOrdinal with a custom color range. Interactive tooltips appear on mouseover showing precise petal length values, while hover effects alter rectangle opacity. The SVG rendering incorporates custom styling with d3.axisBottom, d3.axisLeft, and formatted values using d3.format('.2f').