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| | ADW: Physeteridae: Information |
 | | These whales include the very large giant sperm whale, which reaches lengths of over 18 m and weights in excess of 53,000 kg, and the (relatively!) dimunitive pygmy sperm whale, which attains a mere 4 m in length and 320 kg in weight. |
 | | Sperm oil, extracted from the spermaceti organ and from the blubber, remains liquid even at low temperatures and was used as a fine industrial lubricant. |
 | | Curiously, while sperm whales unquestionably have teeth, recent molecular data and a reanalysis of their anatomy has suggested that they may be highly derived mysticetes. |
| animaldiversity.ummz.umich.edu /chordata/mammalia/cetacea/physeteridae.html (691 words) |
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