xnomo3: A system for representing bird taxonomy

Place two spaces in the first two columns.

Enter the one-character status code in the third column. This is normally blank, but may be “?” for dubious or “+” for extinct.

Enter the scientific name. The taxon is generally a binomial, but it may include a subgenus as it customarily represented: in parentheses, between the genus and species names.

Enter one slash (“/”), followed by the English name.

Multi-word names are encoded as “G, S”, where G is the last word or hyphenated group and S is the preceding words, e.g., “Owl, Great Gray”.

In most cases, you're done. However, if this species is involved in a collision—that is, if it is one of a group of two or more names that abbreviate to the same code according to the rules—enter another slash (“/”) followed by the disambiguation, that is, the substitute code for this species.