Between September 2017 and February 2019, the Fredericksburg Birding Club (FBC) conducted 12 bird surveys at George Washington’s Ferry Farm. We did three in spring, one in summer, three in fall, and five in winter. During that time, we saw 78 of the 136 species listed in the “Checklist of Birds at Ferry Farm” pamphlet and saw 3 new species for a total of 81 species spotted. All observations were recorded at ebird.org.[i] A full list of species observed by the FBC during this time follows.
The chart below compares species listed in the “Checklist of Birds” with those seen by the FBC by abundance designations. Some species vary in abundance with season and, in those cases, these species were given the designation used during their most abundant season. For example, Catbirds are uncommon in spring, common in summer and fall, and rare in winter. Nonetheless, in the chart, they were designated as common because summer and fall are when they are encountered most, spring sightings are the “earlybirds” anxious for warm weather, and winter sightings are out-of-habit occurrences.
|Designation||Definition||# of species on “Checklist of Birds”||# seen on FBC surveys|
|Common||Likely to be seen or heard in suitable habitat||23||23|
|Uncommon||Present, but not certain to be seen||44||29|
|Occasional||Seen only a few times during a season||40||8|
|Rare||May be present but not every year||13||2|
|New||Not listed in checklist||(3)||3
As you can see, we observed all birds listed as abundant or common. In addition, we saw 29 of 44 listed as uncommon; eight of 40 species listed as occasional; and two of 13 as rare. We also sighted three species not listed: the American Pipit, Red Headed Woodpecker, and Pied-billed Grebe. These sightings bring the total of rare birds at Ferry Farm up to 16 and the total number of bird species seen to 139.
We don’t think the low numbers of uncommon, occasional or rare species indicate a trend as we are comparing 12 field days over 18 months with former Ferry Farm staff member Paul Nasca’s eight years of intense observation.
However, we noted two differences in frequency of sightings compared with the “Checklist of Birds.” We only sighted one Catbird and they are listed as common in spring and summer. In contrast, we have seen Bald Eagles on five of our 12 outings and they are listed as occasional. Again, at this point in our surveys, these are just interesting observations to follow, not necessarily trends. This year, we expect to pick up more uncommon species and hopefully some occasional species. We’ll see if any of rare ones show up.
Four of the surveys were conducted during the breeding season — spring through summer — and that data was entered into the Virginia Breeding Bird Atlas 2 (VABBA2) database. This atlas is the second for Virginia, the first being compiled from data collected between 1985 and 1989. VABBA2 will document breeding birds throughout the Commonwealth with data collected over five breeding seasons from 2016-2020.
The VABBA2 database notes specific behavior observations that indicate breeding. By those criteria, we confirmed breeding of four species: Tree Swallow, Northern Cardinal, Chipping Sparrow, and House Finch. We also observed probable breeding of four additional species: American Crow, Eastern Bluebird, Common Yellowthroat, and Carolina Chickadee. While we know these and other species breed at Ferry Farm, we have to observe behaviors or actual juvenile birds to document the breeding.
Highway noise from State Route 3 and the Blue-Gray Parkway at the south end of the property may be a factor in bird observations for both birds and birders. Studies have documented birds abandoning nesting areas or changing breeding songs so they can be heard. Additionally, highway noise makes it difficult for birders to hear songs, which affects observations of both bird presence and breeding activity.
The club’s major goal this year is to increase field days in the spring and summer both to document bird presence, particularly of uncommon and occasional species and to observe breeding behavior for VABBA2, increasing the number of confirmed breeding species at Ferry Farm.
Maureen Daly Hamm
Fredericksburg Birding Club
[i] During the non-breeding season, all birding data is entered directly into ebird.org at “George Washington’s Ferry Farm” hotspot. During the breeding season, the data must be entered through https://ebird.org/atlasva/home. VABBA2 has split Virginia into geographical blocks and the breeding data must be entered in the block where the birds are observed. Unfortunately, Ferry Farm falls into two different blocks. The southern field area is in block 0380277C4SW, and the remainder of the property is block 0380277C4CW. We submit data for the southern field area as “George Washington’s Ferry Farm 038077c4SW” The block 0380277C4CW data encompassing the majority of Ferry Farm property is listed simply as “George Washington’s Ferry Farm.” We will investigate ways to make the data simpler to access, but it may not be possible until the breeding bird survey is complete.