What trees do goats like?

I didn't read anything about Walnut trees on this thread. Is it okay for them to eat the leaves off of them?

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My goats are big fans of black walnut. I believe the herbal wormer that Hoegger's sells contains some black walnut so that's a bonus in my book.

My goats love black locust so I bet honey locust is great too. It's in the bean family so maybe it has higher protein?

Other favorites here in Kansas are Siberian elm saplings and Catalpa trees.