Yes and no, the web is a lot of peoples opinions for the most part. Asparagus berries are mildly toxic, are they going to poison a goat? NO not unless that's all they are eating. Same with Yucca, mildly poison...make sure that they eat other things as well. Here's what my pasture looks like. Are there toxic plants out there? Definitely. Do they die from eat them? Never, they aren't ONLY eating toxic plants.