Willow twigs, safe?

[ruthigrace23]

So this may seem kinda silly but is it okay for them to consume willow twigs? I have a tunnel made from willow twigs (said safe for guinea pigs). I guess I just expected them to chew on it and be left with wood savings... but they eat it. Surprised me and makes me slightly nervous because it seems so weird to eat wood...

 

[Wiebke]

Yes; also safe are apple and pear twigs and leaves.

 

[DarwinTesla]

We had to take ours out of their area as Darwin was beating the hell out of Tesla with them, but other than that I think they're fine.