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Areas of Importance
Ring-Billed Gull (RBGU)
19a Howard Slough
| Year | Mean | Peak | % of GSL Mean |
| 1997 | 418.3 | 2460 | 11% |
| 1998 | 495.4 | 4664 | 8% |
| 1999 | 179.2 | 1269 | 5% |
| 2000 | 777.9 | 2831 | 15% |
| 2001 | 495.8 | 1790 | 13% |
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| Year | Mean | Peak | % of GSL Mean |
| 1997 | 418.3 | 2460 | 11% |
| 1998 | 495.4 | 4664 | 8% |
| 1999 | 179.2 | 1269 | 5% |
| 2000 | 777.9 | 2831 | 15% |
| 2001 | 495.8 | 1790 | 13% |
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