Comal County Cave Swallows in 2003
Each triangle is a Cave Swallow nest site in Comal County.
This map shows in red the number of Cave Swallow nests found at each
Gray lines are the roads in the county. As can be seen, all nest
sites found were under
man-made strucures along the roads. These structures were
bridges, overpasses, underpasses
and culverts. Corrugated steel culverts were not used, only
concrete culverts, regardless of size.
Railroad bridges were plentiful but not used by swallows for nest sites.
Railroad overpasses however often were used for nest sites. Many
nest variations were
For those familiar with the county, note the lack of nesting along
highway 1863 as opposed
to highway 46. Hundreds of potential nest sites were checked and
highway 1863 had its share.
However recent construction along its entire length has discouraged
nesting for the time being.