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The attempt at "Quantifying Threats to Imperiled Species in the United States" (BioScience 48: 607-615), by David S. Wilcove and colleagues, is a timely reminder of the importance of Natural Heritage Programs and systematic data on plant and animal populations. Last July, it was our privilege to reexamine an area studied by Arthur Cleveland Bent and colleagues in 1905-1906 and reported on in The Auk (1907)(1908). Unfortunately, these early explorers were so intent on documenting occurrence thatdoi:10.2307/1313531 fatcat:325pug5qlvgo5oyk6z4pgklo3q