Plants can't move away from hungry animals looking for a tasty treat. So, some plants grow pointy prickles, sharp spines, or threatening thorns to keep themselves safe. One poke from these plants tells unwanted visitors to eat somewhere else!

A bite to eat -- Prickly protection -- Thirsty plants -- Spines for shade -- Pretty thorns -- A giraffe's dinner -- Thorns as homes -- Stinging hairs -- Don't touch!