goats eat mangrove leaves. can you believe it?

My first thought about this topic is, "Is there anything that a goat wouldn't eat?". We do have farms and there are people I know who have goats. They can't stop munching the whole day, and it's quite impossible to even imagine that they'd not eat something other than everything. Is this really a phenomenon when the goat eat mangrove leaves? Do you know of any other leaves that the goats wouldn't eat? I thought they ate anything they could munch on.