Can Russian Tortoises eat Dieffenbachia?

Why

[confidence: high] [source: The Tortoise Table plant database, ASPCA toxic plant list cross-referenced with chelonian veterinary literature, and exotic reptile vet review from a board-certified herpetological veterinarian] Dieffenbachia contains insoluble calcium oxalate crystals and proteolytic enzymes that cause intense oral irritation, swelling, and tissue damage upon ingestion; these effects are equally hazardous to herbivorous tortoises such as the Russian Tortoise. Ingestion can lead to excessive salivation, dysphagia, and potentially systemic effects in small reptiles.