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Stay up-to-date on operations adjustments and temporary closure of TPWD offices, state parks, recreation facilities and water access points due to COVID-19. Please follow guidance from local authorities, Governor Greg Abbott and the Texas Department of State Health Services.


Project Prairie Birds

A Citizen Science Project for Wintering Grassland Birds

Establish Line Transects

Long Prairie Grasses
Photo Lark Sparrow Copyright Michael L. Gray

Lark sparrow
Photo Copyright Michael L. Gray

Monument Your Sites

Mark your sites in such a way that they can be easily located in future years even without you present. This includes a general map of the area as well as a specific hand-drawn map of where each transect begins and ends (see example). It will be important to take slide photos annually of each transect from the same spot with some reference of scale (i.e., have a person standing in the grass at the same exact spot each year). Determining the location with a GPS unit is highly recommended, but not always feasible. Drive a brightly painted piece of rebar deep into the beginning of the transect making sure it is clear of cattle, humans, tractors, etc. Simple flagging has a very short life span since deer and cattle browse on them, while normal weather conditions accelerate rotting. Use tall t-posts, conduit, or PVC; use metal if your area is burned regularly.

We recommend driving a 4’ piece of rebar about 1-2’ deep in the ground with a 6’ piece of PVC slipped onto it. This is very visible and safe for cattle and tractors. Replace the PVC when needed (i.e., after a fire). Check your local hardware store for these very inexpensive items.

We recommend monumenting in the fall at least two weeks prior to a December avian survey.

We also recommend that a team establish no more than 10 transects total to avoid over-committing. Please conduct some practice runs weeks before your first official survey. The practice will help build confidence and field experience.

Figure 1
View of transect from above.

Drawing of transect.


Sample Field Map


In Anywhere County, drive south on Highway 3 for 6.2 miles south of the intersection of FM 691 and Highway 8. Turn left on gray gravel road. Proceed 3.1 miles to the start of the transect. Park at the old barn. Walk south 10 m towards windmill on horizon (175°) to first transect marker – a white PVC marker. See map below.

For Additional Information write to:

Project Prairie Birds Program
Texas Parks and Wildlife Department
4200 Smith School Road
Austin, TX 78744
or send a message to: