trilobite
['puffer, pufferfish, blowfish, globefish', 'pickelhaube', 'buckeye, horse chestnut, conker', 'leatherback turtle, leatherback, leathery turtle, Dermochelys coriacea', 'breastplate, aegis, egis', 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'ground beetle, carabid beetle']