Can they eat sharkfin melon leaves?

[Two toes]

My chickens love to go over to my sharkfin melon plants and eat the leaves, is this safe? Their poo looks very dark green, but they don't really look sick as far as I can tell.

 

[Evanloveschickens]

My chickens love to go over to my sharkfin melon plants and eat the leaves, is this safe? Their poo looks very dark green, but they don't really look sick as far as I can tell.View attachment 2273202

If it isn’t good for them they won’t Eat it don’t worry. They aren’t babies

 

[Two toes]

If it isn’t good for them they won’t Eat it don’t worry. They aren’t babies

Thanks, I'm worried because mine are really dumb when it comes to eating things!