Correction: The national flag of Mexico (tricolor green-white-red) does not depict an eagle.** The **Coat of Arms of Mexico**—centered on the white stripe of the *state* flag and used on government documents, coins, and the presidential flag—features a **golden eagle (águila real) perched on a prickly pear cactus (nopal) devouring a serpent**.
| Element | Civil Flag | State/War Flag |
|---|---|---|
| Tricolor (green-white-red) | ✓ | ✓ |
| Coat of Arms centered | ✗ | ✓ (mandatory) |
| Eagle depicted | ✗ | ✓ (within Coat of Arms) |
There is **no fixed "eagle size" in centimeters or inches**. The coat of arms occupies a defined fraction of the flag's hoist (height). The eagle's proportions *within* the coat of arms are fixed by heraldic tradition, but the absolute size depends entirely on the flag's dimensions (desk flag → stadium banner).
So: No eagle on the civil flag. On the state flag, the eagle is "as big as the coat of arms requires"—which scales with the flag.