sand tiger: shallow-water shark with sharp jagged teeth found on both sides of Atlantic; sometimes dangerous to swimmers
vertebrate: animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
ocean sunfish: among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters