Two proteins have been found to play a major role in toothed whale echolocation. The killer whale is known to prey on numerous other toothed whale species. Fossils discovered later, nevertheless, showed that this was a toothed whale. Kentriodon is an extinct genus of toothed whale related to modern-day dolphins. Otekaikea is an extinct genus of toothed whale closely related to "Waipatia". Being a toothed whale, pilot whales have a single blowhole. Odobenocetops () is an extinct genus of small toothed whale known from Peru and Chile. Toothed whale whistles do not appear to be used in echolocation. The toothed whale is a suborder of the cetaceans characterized by having teeth. Toothed whale biosonar clicks are amongst the loudest sounds made by marine animals. A primitive toothed whale called "Xenorophus sloanii" was preserved in Charleston County. The raptorial toothed whale, "Livyatan melvillei", may too have posed a threat to these whales.