This visualization shows the first-egg laying dates of 44 songbird species in the Netherlands from 1986 to 2014, revealing a clear trend toward earlier breeding seasons. Each species is represented as a horizontal line, with year on one axis and day-of-year on the other; the animated SVG chart scrolls through the decades, and the data points drift downward as the years progress, illustrating the impact of warmer springs. The D3 v3 visualization uses circles connected by lines for each bird species, colored to differentiate them, with the overall downward slope highlighting the shift to earlier egg-laying dates. Hovering or inspecting individual species reveals its specific trend across the 29-year period.