Skip navigation.
Loudoun Co. (VA) 2009-2013 (data entry closed)


General Methods
Sampling & coverage of blocks

Each block consists of 1/6 of a USGS 7.5 minute topographic quad.

Coordination of coverage

Breeding Evidence Codes
Code Code description  (see handbook for full description & use suggestions)
OB Category - Observed: not breeding evidence
E Observed outside of safe dates, not exhibiting breeding behavior.
O Observed within safe dates, not in breeding habitat.
PO Category - possible breeding evidence
X Heard or seen in breeding habitat within safe dates.
PR Category - probable breeding evidence
A Agitated behavior or anxiety calls from adult.
P Pair seen within safe dates.
T Bird holding territory (counter-singing, chasing, etc.).
C Courtship behavior or copulation.
N Visiting probable nest site.
B Adult wrens or woodpeckers carrying nesting material or nest building.
M A species is observed or heard (in suitable habitat during the breeding season) at 7 or more stops along a miniroute.
CO Category - confirmed evidence of breeding
NB Adult carrying nesting material or nest building (except wrens and woodpeckers).
DD Distraction display.
UN Used nest or eggshells found.
FL Recently fledged young.
CF Parent carrying food, feeding young, or removing fecal sac.
RC Raptor performing a courting display or repeatedly carrying food to a specific area.
ON Parents leaving/entering nest site or on nest.
NE Nest with egg(s).
NY Nest with young seen or heard.
Habitat Codes
- - this atlas does not record habitat on the field card - -

Where this information came from
Most of the information on this page is from the project's publication or Handbook (guide for field work).
U.S. Department of the Interior || U.S. Geological Survey || Patuxent Wildlife Research Center  Laurel, MD, USA 20708-4038
This site is:
Information contained in this application does not necessarily have the endorsement of USGS.

Last updated: Site - May 2014; Content - various, depending on atlas.
Page generated on: 06-Dec-2022