Fig. 3

Aa and Ba show the eye stripe and a broad longitudinal band on the variegated back respectively of the Gallus gallus chick, which is similar to spurfowls. Ca and Da show the broken facial marks (i.e. disconnected remnants of stripes) and crown respectively of Tetrao tetrix chicks, which are also often found in Asian francolins. Db shows the connectivity of the central dorsal line from the crown across the back, which is often associated with the subfamily Tetraoninae