Here There be Monsters: The Legendary Kraken and the Giant Squid by HP Newquist

From chapters.ca:
Hundreds of years ago, there were many unexplored regions of the world. These areas were left blank by mapmakers... but something sinister was out there. Sailors claimed that these faraway places were inhabited by mysterious beasts and sea serpents. To warn of the dangers lurking on land and under the sea, mapmakers wrote words that would chill the hearts of even the bravest explorers: Here There Be Monsters. One of those monsters that caused fear in sailors all over the world had huge eyes, an enormous head, and a razor- sharp beak. Most terrifying of all were its tentacles and slithering arms, each lined with hundreds of suckers. The creature was strong enough to grab an entire ship and drag it down - along with all the men on it - to the dark depths of the ocean. This monster was the legendary kraken. From the ancient Greeks and Phoenicians on to the Vikings and even American fishermen, those who sailed the seas hoped to steer clear of the kraken and the destruction it could wreak upon them. At the same time, this terrifying creature lured artists and scientists into its dark, watery world. Their stories and images of the kraken have thrilled readers on dry land for centuries. In HP Newquist's fast- paced account, you will see with your own eyes how long- ago myths about the kraken transformed into the modern study of Architeuthis dux, the giant squid. Weaving scientific discovery with historical accounts - along with the giant squid's appearance in film and literature - Here There Be Monsters expolores the mystery of this creature in fascinating detail. Readers will find that the monster remains hidden no longer, because scientists have finally seen the kraken with their own eyes... alive and rising up out of the sea.