Eyes not moving with the head

[Lionel]

Hi,
i’m learning Blender and i’ve made a simple rig to the model in attachment.
When i go to Pose mode and i rotate the head bone or the backbone, i expect the eyes to rotate together with the head but they don’t , they act like a separate object but i’m sure they belong to the character object.

Please can you check the attachment and tell me why is this? personaggio.blend (548 KB)

Thanks!

[Richard_Marklew]

The eyes have zero weight. In weight paint mode or in the vertex group panel add them to the backbone.001 veretx group with 100% weighting