trilobite
['platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'hook, claw', 'pillow', 'buckeye, horse chestnut, conker', 'hen-of-the-woods, hen of the woods, Polyporus frondosus, Grifola frondosa', 'crutch', 'jellyfish']