| | | 1995 | 113 |
| | | 2000 | 51 |
| | | 2002 | 638 |
| | | 2005 | 129 |
| | | 1988 | 64 |
| | | 1997 | |
| | | 1996 | 65 |
| | | 2000 | 114 |
| | | 2003 | 74 |
| | | 2004 | 145 |
| | | 2011 | 420 |
| | | 2009 | 119 |
| | | 2003 | 162 |
| | | 2004 | |
| | | 1990 | 67 |
| | | 1995 | |
| | | 1997 | 444 |
| HistoryJournal:The Gardens' Bulletin, Singapore | | 1995 | 34 |
| | | 2002 | 84 |
| MammalsJournal:The Gardens' Bulletin, Singapore | | 1995 | 33 |