| Dead |
| Gone |
| Defunct |
| Vanished |
| Obsolete |
| Died out |
| Wiped out |
| As a dodo? |
| As the dodo? |
| Gone forever |
| Like the moa |
| Completely gone |
| Having died out |
| No longer around |
| Out of existence |
| No longer active |
| Out of this world |
| Dead (of species) |
| No longer existing |
| Like ground sloths |
| Like the dinosaurs |
| Permanently inactive |
| Like the Tasmanian wolf |
| Like dodos and dinosaurs |
| No longer living, like dinosaurs and woolly mammoths |