The Old Icelandic saga Örvar-Odds saga referenced the massive heather-backed sea-monsters of the Greenland Sea named
Hafgufa and Lyngbakr that fed on whales, ships and men. After returning from Iceland, the anonymous author of the
Old Norwegian scientific work Konungs skuggsjá (c. 1250) described in detail the physical characteristics and feeding
behavior of these two beasts and suggested the pair may possibly be the same animal, regarded by the Norse as the Kraken.
The narrator proposed there must only be two krakens in existence, stemming from the observation that the beasts have
always been sighted in the same parts of the Greenland Sea, and that each seemed incapable of reproduction as there was no increase in their numbers.
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