| Clue | Source | Date |
|---|---|---|
| Lions and Bears (but not Tigers) | Wall Street Journal | 14 Sep 2024 |
| Two of them meet every year in the Super Bowl | New York Times | 27 Sep 2021 |
| Patriots and Packers, e.g | Eugene Sheffer | 18 Oct 2017 |
| Lions and Bears, but not Tigers | ||
| Jaguars and Panthers | ||
| Gridiron orgs. | ||
| Giants and Titans, e.g. | ||
| Browns and Bills |