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Comment by pvaldes | Hacker News Reader

More like mini dolphins. 90Kg is a respectable weight for a common porpoise. A range of 30-70 Kg is more common

Porpoises are tiny for a cetacean and secretive, don't jump and are not easy to spot in the sea. All you see is a blunt triangle. Would never be confused with a plesiosaur

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Wikipedia says,

  Porpoises range in size from the vaquita, at 1.4 metres
  (4 feet 7 inches) in length and 54 kilograms (119 pounds)
  in weight, to the Dall's porpoise, at 2.3 m (7 ft 7 in)
  and 220 kg (490 lb).

Doesn't say what is most common, though, so if 30-70 kg is more common, I'll take your word for it.

Dall's porpoise is from the North Pacific. Harbour porpoise is the only porpoise that could enter in the Loch Ness. The Californian porpoise was even smaller.

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