Q. A student is comparing traits for five related bird species. They make a chart and record data for four different traits. They then use the chart to make a cladogram showing their hypothesized relationships among the species.
| 1 | 2 | 3 | 4 | 5 |
Head Size | 20 cm | 20 cm | 20 cm | 20 cm | 20 cm |
Beak Color | Black
| Blue | Blue | Black | Black |
Eye Color | Black | Black | Red | Red | Red |
Eye Number | 2 | 2 | 2 | 2 | 3 |
Based on the chart, what is an ancestral trait for all of these species?