To better sample rare or highly specialized anurans in some regions, further stratification beyond a general approach to placing points at wetlands may be needed. The easiest way to accomplish this would be to identify section roads. Stopping every .5 mile along this road would be a good sampling technique. Recorded with a directional microphone and a tape recorder all calling species at each stopping point. Each data collecting group should follow a different road.
Wetland breeding sites for amphibians come and go.
The stops should not be changed to incorporate new sites or eliminate sites that are no longer available. This is important because even if the main wetland is destroyed, other water sources, such as water control pits and drainage ponds, may still provide suitable frog habitat. Under unusual circumstances it may be possible that new forms of wetland may be developed where none formerly existed. A review of wetland trends every 5 years should catch any such changes. Counts should begin one-half hour after sunset, approximately when birds stop calling.