During the migratory season, an incredible team of volunteers count swifts along the “string of (chimney) pearls” – the various chimneys, stacks, etc. from BC to California that our migrating Vaux’s Swifts use for roosting.
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The prime directive for southbound 2011 was to get a boatload of data from Northern State Hospital and JBLM (Joint Base Lewis-McChord) chimneys, both of which we felt would be super-important roosting sites, but we didn’t have the data to be sure. See what our counts were:
| Date | N State | JBLM |
| 8/29/11 | 2820 | 1024 |
| 8/30/11 | 950 | |
| 8/31/11 | 900 | |
| 9/1/11 | 1735 | |
| 9/2/11 | 6940 | 2886 |
| 9/3/11 | 9900 | 2698 |
| 9/4/11 | 3941 | |
| 9/5/11 | 12500 | 1850 |
| 9/6/11 | 4365 | |
| 9/7/11 | 14070 | 2810 |
| 9/8/11 | 5210 | |
| 9/9/11 | 9252 | |
| 9/10/11 | 15700 | 6995 |
| 9/11/11 | 7875 | |
| 9/12/11 | 5400 | 4230 |
| 9/13/11 | 8080 | |
| 9/14/11 | 8800 | 12960 |
| 9/15/11 | 14697 | |
| 9/16/11 | 13400 | 9710 |
| 9/17/11 | 7100 | 4530 |
| 9/18/11 | 9710 | |
| 9/19/11 | 2930 | |
| 9/20/11 | 15900 | 3220 |
| 9/21/11 | 9420 | 4787 |
| 9/22/11 | 20965 | 4920 |
| 9/23/11 | 11850 | 4670 |
| 9/24/11 | 3590 | 8180 |
| 9/25/11 | 7400 | 3780 |
| 9/26/11 | 3560 | 1600 |
| 9/27/11 | 9370 | 1230 |
| 9/28/11 | 6000 | 1545 |
| 9/29/11 | 9500 | 2398 |
| 9/30/11 | 3540 | 3174 |
| 10/1/11 | 1580 | 1532 |
| 10/2/11 | 4300 | 1800 |
| TOTAL | 203,605 | 162,174 |