I've been to the vets this morning with my Ivy because she's had really bad sickness all week, isn't eating etc and as she seems ok in herself and all her vitals are perfect we're putting it down to the Yucca plant that she keeps eating. It doesn't show on the list of plants on the link posted by Lynn but it is listed on other websites.

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RIP Bob 17/01/2009
We'll always miss you x