Kodiak "Dinosaur": A large unidentified sea creature detected with sonar surveillance equipment near Kodiak, Alaska. Described as "an enormous 'creature,' between 150 and 180 feet long, with two pairs of flippers, an extended tapering tail, and a long, slender neck capped by a rather snub-nosed head!" The basic description of the creature matches a plesiosaur, but it is unlikely that plesiosaurs survived to modern times, let alone in a cold climate like Alaska. Has also been identified with the prehistoric whale Basilosaurus.
Lake Illiamna "monsters": Giant sturgeon-like fish sighted in Lake Illiamna in Alaska.
Partridge Creek Monster: A giant dinosaur-like animal with a horn on it's nose reportedly from Alaska, Northern Canada and Siberia. Said to be 50 feet long, and covered in "bristles" (Proto-feathers?). Reportedly seen preying on caribou. Often identified with Ceratosaurus, due to similar appearance, but more likely a tyrannosaurid if anything.
Steller's sea-ape: A creature which Steller encountered off of Bering Island in the Bering Straight. Called a sea-ape, not from the creature's appearance, but from the antics and tricks it did while playing in the water. He said it's head resembled a wolf, but it had no front flippers and an asymmetrical tail. May be an undescribed pinniped.
Steller's seacow: A 20 foot long sirenian once plentiful Bering Strait, but was wiped out less than 50 years after it's discovery. However, some Russian whalers allegedly saw several large sea mammals that looked exactly like the giant seacows, and there have been numerous other sightings up until the present. It is highly likely that some of these have survived.
Steller's "white sea-raven": Steller, while stranded on Bering Island, claimed to have seen a pure white "sea-raven" flying over the ocean. It should be noted that German's at that time referred to cormorants as "sea-ravens". As Steller was German, it is likely that he was referring to a white cormorant. Could be a new species, or simply an albino of a known species.
Tizheruk: Also known as Pal-Rai-Yûk. A sea serpent from Inuit mythology said to inhabit the waters near Key Island, Alaska. It is said to have a 7-foot head and a tail with a flipper. Locals claim that it has snatched people off piers without their noticing its presence. It is said to be similar to the Ogopogo.
Toonijuk: Also known as Arulataq. Very large hairy hominids that are said to live in crudely constructed huts made of bone. May be related the the Siberian Chuchunaa.
Waheela: A large white wolf-like animal. Described as a cross between a wolf and a bear. May be a relict amphicyonid. Inuit mythology makes mention of a creature called the Amarok which may be the same species.
Wendigo: A man-eating humanoid creature from native folklore. Often described as a large bipedal creature reaching heights up to 15 feet, with glowing eyes, long yellowish canine teeth, and in in some cases, a hyper-extended tongue. Other accounts of the Wendigo say that the creature has no fur at all and a pale almost dead looking skin. May be an exaggerated version of the Toonijuk or the Sasquatch.