Squids have actually retained a remnant of their ancestors’ shell inside their body, a feather-shaped structure called the gladius. One of the distinct differences is in the internal shell, or “pen.” The majority of octopus species have no hard internal shells or bone structures, allowing them to squeeze themselves in and out of tight places along the reef (and often in aquariums, baffling the staff until they see it for themselves!). The internal makeup of octopus and squid is also unique to each cephalopod. Squid eyes are embedded in the head between the tentacles and mantle of the body. Octopus eyes protrude from the top of the head, bulging near the tentacles. The eyes of the octopus and squid are also placed differently. The head and body of an octopus visually blend into one form, whereas the separation between body parts is much more defined on squids. Squids have eight legs of a uniform length, and two longer tentacles with sucker pads for grabbing prey. ![]() The body of a squid, on the other hand, tends to be shaped like a torpedo with most species having a pair of fins extending from the mantle, or body. An octopus typically has a bulbous body with eight tentacles of equal length. Octopus and squid actually have very different body composition. They are both cephalopods that appear very similar in structure, but also have very distinct characteristics that distinguish them from one another. ![]() Two such animals are the octopus and squid. Amongst all these variations in size, shape, and appearance, there are some species that bear some similarities to one another. Predatory techniques vary from passively waiting for prey to float by to aggressive packs hunting and herding their food as a team. The oceans of the world have a near infinite variety of life, ranging from microscopic phytoplankton to whales over 100 feet in length.
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