Nut Grass?

[Zorro1]

I'm wanting to let the guinea pig run around in an outside cage, but I'm a little concerned if he can eat this weed that is everywhere on the lawn....



Is it Nut Grass? Does anyone know what it is and if the guinea pig can eat it?

 

[A Guinea Pig]

I found Nut Grass here: Guinea Lynx :: Common Forages. Mabye that’s it