Lots of plants exhibit toxic qualities, rhubarb among them. Surprisingly, many animals have the "smarts" in-born in them, to avoid such plants. For example, our goat would sample, taste, and gobble most any plant offered her, (but not tin cans!), however, offered oleander she sniffed, then instantly bolted away! Oleander leaves are poisonous!
Another of the goat's antics involved eating the leaves and berries of our Pyracantha bush (Firethorn), which has half-inch long spikes of thorns up and down it's branches. The goat happily partook of the leaves, twigs, berries, and all, oblivious, seemingly, to those nasty thorns which had often scarred my hands & wrists while pruning! imp
