After the whale shark, the basking shark is the second largest living fish, and can grow up to 32 feet long. These sharks are often mistaken for plesiosaurs, a group of long-necked, predatory marine reptiles that lived at the time of the dinosaurs
Narwhals. . . The Narwhal (meaning "corpse whale" in Old Norse) is a rarely seen Arctic whale. This social whale is known for the very long tooth that males have. Very little is known about this whale.
The Oarfish is a rare, solitary, and giant denizen of the ocean depths (arguably larger than a Whale Shark. (The Oarfish,17m as opposed to the Whale Shark, 12.96m in the Guinness Book of World Records.)) and is a filter feeder, comfortable cruising at depths of 200 m. Mistakenly named for its prominent pectoral oars with which it was thought to 'row', it undulates serpentlike with its dorsal fins and has been seen orienting itself vertically.
Southern Right Whale Dolphin: They look like an orca whale mixed with an Infinity and a yin-yang. The Blue Planet Society tweeted this photograph of one taken by Pablo Caceres off the coast of Valparaiso, Chile. This is one glorious-looking animal.