Squids use their two specialized tentacles to quickly reach out and capture fishes. They then release salivary enzymes, loosening the meat from the inner shell. Octopuses pierce the shells of their prey, injecting venom that causes paralysis. Squids have eight arms lined with suckers and two specialized tentacles that they use to reach out and capture prey. Octopuses use their eight sucker-lined arms to capture their prey and move about on the ocean floor. The lens is focused by moving, much like the lens of a camera or telescope, rather than changing shape like a human eye. The eyes of a Squid, found on either side of the head, each contain a hard lens. Most octopuses do not have fins as adults.

These fins steer and stabilize the squids when moving slowly, and wrap around the body when they move quickly, by way of jet propulsion. Squids use fins located on their heads to propel themselves when swimming at low speeds. Octopuses and squids can swim in any direction and can alter their course quickly. Octopuses and squids move by 'jet propulsion', sucking water into a muscular sac in the mantle cavity surrounding their bodies and quickly expelling it out a narrow siphon. They have a short life span and may not live upto more than 4 to 5 years but can grow quite heavy in weight. Octopuses grow in size from upto 1cm to about 5m. There have even been claims reported of specimens of up to 20 metres (66 ft). The majority of squid are no more than 60 cm long, although the giant squid may reach 13 m in length. Both creatures have similar, though not identical, organ systems. The blood in both creatures contains a copper-rich protein known as hemocyanin. Two pump blood through the gills, while the third heart is dedicated blood circulation through the body. Squid (when referring to a collective) Squids (when referring to 2 or more species of squid)īoth squids and octopi have three hearts each.

In salty water of the tropics to the temperate zones. Squid catch food with their two long tentacles and eat it in chunks. Octopi grab their prey and pierce through its shell and inject paralyzing venom into it. Squid maybe solitary or may live in schools Octopi are solitary in nature and always live alone There have been unconfirmed reports of squid as large as 20m (66ft). Giant squids up to 13m (43 ft) long have been recovered. The average squid is no more than 60cm large. Octopuses range in size from 1cm to more than 5m. Most octopi do not have fins, though some deep water octopuses may be the exceptions. Squid and cuttlefish have a combination of arms and tentacles. Tentacles have suckers only at their tips but arms are covered in suckers. It is a head-footed animalĪn Octopus has a mantle, a head, 8 arms endowed with 1 or 2 rows of suckers but no hooks or sucker ringsĪ standard Squid has 2 fins, a mantle, a head, 8 arms and 2 tentacles each endowed with hooks and/or suckers or sucker rings Squid is a cephalopod with eight arms and two tentacles arranged in pairs. Squid possess a stiff structure known as a pen, which acts like a flexible backbone Octopi do not have any shell or stiff bone in their body Differences - Similarities - Octopus versus Squid comparison chart

Better than site sucker