Bird Species by Average Mass
| Common name | Average mass (kg) | Capable of flight? |
|---|---|---|
| Lesser rhea | 19.6 | No |
| Dalmatian pelican | 11.5 | Yes |
| Andean condor | 11.3 | Yes |
| Northern cassowary | 44.0 | No |
Most bird species that are capable of flight weigh less than a kilogram (kg), which is not surprising considering the burden that extra body weight puts on a flying animal. But not all flying birds are so light, as we can see most clearly in the example of the __________