| A California quail and a Bewick's wren are among four bird subspecies found only on Santa Catalina. |
| Based on these specimens, the races of two species of buttonquail were revised and five new subspecies described. |
| The allopatry of Middle American subspecies, and their diversification, may be attributable to habitat preferences. |
| There are 16 subspecies whose range spreads from India as far as southern China and the Philippines. |
| Domestic cats are thought to have descended from the African subspecies of the wildcat. |
| From there, the species has radiated into several subspecies, two of which occur in Europe and share a hybrid zone. |
