Rules
The basic rules for determining the codes are simple and are similar in both systems:
- For a bird with a one-word name, use the first four letters of the name, e.g., mallard is MALL.
- For a bird with a two-word name, use the first two letters of the first word followed by the first two letters of the second word, e.g., wood duck is WODU.
- For a bird with a three-word name the first two of which are hyphenated, use the first letter of the first word, the first letter of the second word, and the first two letters of the third word, e.g., blue-winged teal is BWTE.
and so on.
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