All of the following terms assume the species is being looked for in the appropriate habitat.
Birds with Hyperlinks will show range maps for regional species or observational data for review species.

Abundant - Applied to a species that can be found in quantity without any special search
Common - Applied to a species noted at least daily with some search
Fairly Common - Applied to a species that may require some search to be detected regularly
Uncommon - Applied to a species that occurs infrequently
Rare - Applied to a species that is seldom encountered except by chance
Casual - Applied to a species that is out of its normal range but can be expected to occur again
Accidental - Applied to a species that is far from its normal range it is not expected to appear again
(IR) - Irregular. If this term is applied under the "nesting" category, it mean this species does not nest here year after year. If it is applied under a season, it means it is irregular during that season. If it falls under "likely seen," the location is irregular.
(L) - Nesting or observed locally. Not widespread. Seen only at certain locations. In the case of certain species, i.e., Scaled Quail, Golden-fronted Woodpecker, Canyon Towhee, Pyrrhuloxia, birds may be found only on the fringe of study area in drier habitat. Other birds such as Ruddy Turnstone regularly show up only at one or two lakes.
(H) - Historical nest records only. None recently.
N,S.E,W (Compass points) Also FW and FE for "far west" and "far east" - SEE MAP -These compass point indicators are used under the "Likely Seen" category to indicate that a species is predominantly found in a certain direction of the area's center, i.e., Pyrrhuloxia is likely seen with a "FW" indicator suggesting the bird is generally found in the far west part of the study area.
Review Species - The letter "X" means the bird is a Texas review species and documentation is required for acceptance. The number beside the "X" is the number of times the bird has been officially observed in North-Central Texas.