| Clue | Source | Date |
|---|---|---|
| Egg-laying mammals | Wall Street Journal | 03 Sep 2025 |
| Egg-laying mammals, in an informal plural | ||
| Egg-laying mammals | Newsday | 12 Sep 2021 |
| Aussie beasts | Newsday | 23 Jul 2020 |
| Symbols of Australia | Newsday | 06 Jan 2019 |
| Duck-billed mammals | LA Times Daily | 26 May 2017 |
| Duck-billed mammals | The Washington Post | 26 May 2017 |
| Duck-billed mammals | ||
| Duck-billed mammals | USA Today | 20 Oct 2016 |
| Venomous mammals | Newsday | 30 Jul 2015 |
| Venomous mammals | ||
| Duck-billed swimmers | ||
| Swimmers with flat feet | ||
| Egg-laying mammals | ||
| Toothless mammals | ||
| Egg layers | ||
| Swimmers with beaverlike tails | ||
| Duckbills. |