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Areas of Importance
Ring-Billed Gull (RBGU)
19b Howard Slough
| Year | Mean | Peak | % of GSL Mean |
| 1997 | 237.6 | 1487 | 6% |
| 1998 | 1509.9 | 8350 | 25% |
| 1999 | 765.7 | 5425 | 23% |
| 2000 | 763.4 | 3913 | 15% |
| 2001 | 950.2 | 3130 | 26% |
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| Year | Mean | Peak | % of GSL Mean |
| 1997 | 237.6 | 1487 | 6% |
| 1998 | 1509.9 | 8350 | 25% |
| 1999 | 765.7 | 5425 | 23% |
| 2000 | 763.4 | 3913 | 15% |
| 2001 | 950.2 | 3130 | 26% |
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