The document describes the black swallower fish, which can swallow prey up to twice its size whole due to its extendable jaw. It feeds on bony fish, lays eggs like most fish, and has a creepy appearance. The text also discusses the giant squid, which is the second largest squid species and can grow up to 13 meters long for females and 10 meters for males. Finally, it mentions the Dumbo octopus, which can turn transparent and is considered a rare ocean organism, with the largest recorded being over 6 feet long.