(Photo found here)

The bicolor parrotfish (Cetoscarus bicolor) is among the largest of parrotfishes, growing to a length of up to 90 centimeters (35 in). As in many of its relatives, it is a sequential hermaphrodite, starting as female (known as the initial phase) and then changing to male (the terminal phase). The initial phase is dark brown with a large cream patch on the upper part of the body. The terminal phase is very colourful, overall green with pink spotting to the body and edging to the fins. Juveniles are white with a black spot on the dorsal fin and an orange band through the eye. Parrotfish can change gender repeatedly throughout their lives, as well as their coloration and patterns, which are a classification nightmare, varying greatly, even among the males, females, and juveniles of the same species. Close relatives of the wrasse, parrotfish are abundant in and around the tropical reefs of all the world’s oceans. There are about 80 identified species, ranging in size from less than 1 to 4 feet (30 to 120 centimeters) in length.

(Source/Source)

(Photo found here)

This is a Hawaiian bobtail squid (Euprymna scolopes); a species of bobtail squid (see this previous post) in the family Sepiolidae. It is native to the central Pacific Ocean, where it occurs in shallow coastal waters off the Hawaiin Islands.

(Source)

(source of photo here)

The North Pacific giant octopus (Enteroctopus dolfeini) may grow to over 9m in length. It has a reddish-brown body, called the mantle, plus four pairs of arms, measuring on average about 4.9m long. Newly hatched young are the size of a grain of rice. Octopuses have the most complex brain of the invertebrates. Like vertebrates, they also have long term and short-term memories. Octopuses learn to solve problems by trial-and-error and experience. Once the problem is solved, octopuses remember and are able to solve it and similar problems repeatedly. Its sense of touch is acute in its suckers. The rim of the cups are particularly sensitive. A blindfolded octopus can differentiate between objects of various shapes and sizes as well as a sighted octopus. Octopuses have highly complex eyes which compare to human visual acuity. Focusing is done by moving the lens in and out rather than by changing its shape as the human eye does. Color change in these creatures is initiated by the eyes. If an octopus is disturbed, special pigment cells (chromatophores) in the skin will be activated in an attempt to blend in with the surroundings.  This octopus lives off the coast of southern California, north along the coastline of the Pacific Northwestern Americas, across the Aleutians and south to Japan. The species occurs at depths from the intertidal to 750m. (For more see these four previous posts)

(Source)