Avutarda Euroasiática vs Sisón Común

The most reliable field mark to distinguish between the Great Bustard and the Little Bustard is size. The Great Bustard is significantly larger, almost twice the size of the Little Bustard. When observing these birds, focus on their size and structure for accurate identification.

Size: The Great Bustard is significantly larger than the Little Bustard, which is the most reliable field mark. Use binoculars to gauge the relative size when both species are present.

The Great Bustard is much larger than the Little Bustard, making size a key distinguishing feature.