The bird called merlin (asalon) breaks the eggs of ravens. Foxes prey on the merlin's chicks, so she pecks both the fox's cubs and the vixen. When the ravens see this, they attack the common enemy, the merlin. The raven is at top left, the fox below, and the merlin at right.
The image was obtained from the source listed below.
Bibliothèque Municipale de Valenciennes