About 8,000 records are added per year. Abstracts added from September 1996 onward. SWIS provides more than 86,000 records drawn from over 400 journals in addition to books, reports of congresses, dissertations, and theses. A main database on wild birds and mammals is supplemented by special files on protected animals and wildlife interaction with traffic, disturbance, and agriculture. Ninety percent of the citations in this file of 21,899 records are drawn from unpublished research reports, field studies, and surveys from U.S. state agencies.
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National University of Costa Rica. Some of the source literature is unique to the region. Duckdata provides 12,371 citations with a valuable focus on game birds and their habitats. The IUCN contributes 3,146 records. Composite records Special, software-created composite records resolve the problem of duplication among files.