A. Within means that the bird must be within the prescribed area when observed, although the observer need not be. For example, if an observer on the U.S. side of the Rio Grande identifies a bird across the river on the Mexican side, the bird may be counted on his Mexican list but not on his ABA Area list.
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ABA Birding Code of Ethics
ASM Spring Meeting: May 2-4, 2014 in Jefferson City Details and Online Registration