As it becomes late in the season, the sparrow activity quiets down a lot. The birds aren’t singing late in the day, there aren’t as many nests to find, and the sparrows are just more difficult to find in general– except for the juveniles.
We have started to see flocks of juveniles flying around and making chip sounds like the adults. Soon the male juveniles will start to try practice-singing like the adults, which is an unrecognizable slur of notes. They are the same size as adult birds, but look and act quite differently. They are lighter in appearance and are only beginning to obtain the defined yellow lore above their eye, making their eye actually look larger than the adults.
Catching and banding juveniles is one of the main activities we are involved in as the season draws to an end, as it is an important way to gather information about their dispersal and survival rates. They often hang out in large groups in sawgrass clumps, which can make passive netting of youngsters a lot easier than adults. We simply set up a net next to a large clump they are likely to go to.
We have also been territory mapping banded adults throughout the season. This is done by taking multiple GPS points of banded males and loading it onto ArcGIS. This allows us to look at sizes of territories and locations of individual birds. The goal for each bird is to get 30 points a season to have an accurat