trilobite
['walking stick, walkingstick, stick insect', 'acorn squash', 'leatherback turtle, leatherback, leathery turtle, Dermochelys coriacea', 'dugong, Dugong dugon', 'electric ray, crampfish, numbfish, torpedo', 'hammer', 'gar, garfish, garpike, billfish, Lepisosteus osseus']