| | | 2002 | |
| | | 2005 | 203 |
| | | 1988 | 179 |
| | | 1997 | 87 |
| | | 1996 | |
| | | 2000 | 118 |
| | | 2003 | |
| | | 2004 | 325 |
| | | 2011 | 407 |
| | | 2009 | 124 |
| | | 2003 | 196 |
| | | 2004 | |
| | | 1990 | 115 |
| | | 1995 | 105 |
| | | 1997 | |
| HistoryJournal:The Gardens' Bulletin, Singapore | | 1995 | 116 |
| | | 2002 | 130 |
| MammalsJournal:The Gardens' Bulletin, Singapore | | 1995 | 157 |
| | | 1986 | 125 |
| | | 2005 | 250 |