| | | 1995 | 111 |
| | | 2000 | 101 |
| | | 2002 | 408 |
| | | 2005 | 203 |
| | | 1988 | 179 |
| | | 1997 | 78 |
| | | 1996 | 152 |
| | | 2000 | 115 |
| | | 2003 | 108 |
| | | 2004 | 322 |
| | | 2011 | 399 |
| | | 2009 | 121 |
| | | 2003 | 194 |
| | | 2004 | 197 |
| | | 1990 | 114 |
| | | 1995 | 102 |
| | | 1997 | 367 |
| HistoryJournal:The Gardens' Bulletin, Singapore | | 1995 | 113 |
| | | 2002 | 130 |
| MammalsJournal:The Gardens' Bulletin, Singapore | | 1995 | 153 |