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Areas of Importance
Black-Crowned Night Heron (BCNH)
19c Howard Slough
| Year | Mean | Peak | % of GSL Mean |
| 1997 | 9.8 | 21 | 3% |
| 1998 | 11.9 | 26 | 6% |
| 1999 | 5.9 | 21 | 3% |
| 2000 | 5.3 | 18 | 2% |
| 2001 | 1.6 | 4 | 1% |
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| Year | Mean | Peak | % of GSL Mean |
| 1997 | 9.8 | 21 | 3% |
| 1998 | 11.9 | 26 | 6% |
| 1999 | 5.9 | 21 | 3% |
| 2000 | 5.3 | 18 | 2% |
| 2001 | 1.6 | 4 | 1% |
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