Toothed whales (Odontocetes) echolocate by creating a series of clicks emitted at various frequencies. Sound pulses are emitted through their melon-shaped forehead, reflected off objects, and retrieved through the lower jaw. Skulls of Squalodon show evidence for the first appearance of echolocation. Squalodons lived from the early to middle Oligocene to the middle Miocene, around 33-14 million years ago. A peculiar blend of archaic and modern features characterize Squalodon. The cranium was well compressed, the rostrum telescoped outward, giving an appearance of modern toothed whales. However, it is thought unlikely that squalodontids have anything to do with the ancestry of most living dolphins.
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