RHEAS
| Date | Clue |
|---|---|
| 2026-01-25 | Large flightless birds |
| 2023-11-09 | Cousins of cassowaries |
| 2018-09-02 | Relatives of emus |
| 2017-04-03 | Cousins of emus |
| 2015-10-05 | Cousins of ostriches |
| 2014-06-05 | Flightless birds |
| 2014-04-02 | Ostrich cousins |
| 2007-08-17 | Birds with a name from Greek myth |
| 2007-04-11 | Ostrich cousins |
| 2006-07-30 | Flightless birds |
| 2003-02-16 | Ostrichlike birds |
| 1999-03-04 | Flightless birds |
| 1996-03-31 | Perlman and others |
| 1996-01-14 | South American ostriches |
| 1994-05-16 | Three-toed birds |