Can Red-footed Tortoises eat Dieffenbachia?

Why

[confidence: high] [source: The Tortoise Table plant database (tortoisetable.org.uk), ASPCA Toxic Plant List, and exotic reptile veterinary toxicology references (e.g., Mader's Reptile and Amphibian Medicine and Surgery).] Dieffenbachia contains insoluble calcium oxalate crystals and proteolytic enzymes that cause immediate intense oral irritation, swelling, and potential airway obstruction; ingestion by Red-footed Tortoises can lead to drooling, anorexia, and serious mucosal damage. There is no safe dose — this plant should be kept entirely out of any tortoise enclosure.