It has been a while since I translated a story from the Gesta Romanorum or The Deeds of the Romans.
Here is story #110 About Ash and Ravens:
"The philosopher reads in a book about animals that if one wishes to make it so that a raven, after it has built a nest in a tree, is never able to hatch chicks from its eggs, one should place ashes of glass (?) among the trees and, while those ashes are there, the raven will not produce chicks."
One would think shards of broken glass might I don't know that ashes of burnt glass would unsettle a nesting bird.
Here is story #110 About Ash and Ravens:
"The philosopher reads in a book about animals that if one wishes to make it so that a raven, after it has built a nest in a tree, is never able to hatch chicks from its eggs, one should place ashes of glass (?) among the trees and, while those ashes are there, the raven will not produce chicks."
One would think shards of broken glass might I don't know that ashes of burnt glass would unsettle a nesting bird.