Plate IV — Population Dynamics 04 / 12
Key Finding

The birds we knew best, we lost first

Life-size portraits of 87 species in the original folio — wild breeding populations down 38% on average by 2024

Index / Percentage 100 75 50 25 0 1827 1860 1900 1940 1980 2024 Year Crossover, c. 1941 100 27 4% 88% Species Catalogued Breeding Pop. Index
Species catalogued (% of known N. American species)
Breeding population index (1827 baseline = 100)
This is the Audubon Birds of America design system, applied by Curio Design — a design-style library for AI agents. Full Audubon Birds of America guide → designbycurio.com/learn/audubon-birds-america-1838