# Giant Squid (*Architeuthis dux*)

> The giant squid (Architeuthis dux) is an enormous deep-sea invertebrate that can reach around 13 m (43 ft) in length including its long feeding tentacles. It lives in deep oceans worldwide, hunts fish and other squid, and swims by jet propulsion, blasting water from its funnel to reach bursts of up to 40 km/h (25 mph). It has the largest eyes of any known animal and is listed as Least Concern.

- **Category:** Invertebrate
- **Conservation status (IUCN):** Least Concern
- **Range:** Deep oceans worldwide, most often recorded in the North Atlantic and around Japan and New Zealand.
- **Canonical page:** https://globalanimalguide.org/animals/squid/
- **Last reviewed:** 2026-07-16

## Scientific classification

- **Kingdom:** Animalia
- **Phylum:** Mollusca
- **Class:** Cephalopoda

## Facts at a glance

| Attribute | Value |
| --- | --- |
| Scientific name | Architeuthis dux |
| Diet | Carnivore (deep-sea fish and other squid) |
| Habitat | Deep oceans worldwide |
| Lifespan | About 5 years (estimated) |
| Size | Up to about 13 m (43 ft) including tentacles |
| Top speed | Up to 40 km/h (25 mph) in a jet burst |
| Conservation status | Least Concern (IUCN) |

## Size and body plan

The giant squid is one of the largest invertebrates ever recorded, reaching about 13 m (43 ft) from the tip of its fins to the ends of its two long feeding tentacles and weighing in the region of 275 kg. Its torpedo-shaped body, or mantle, is far shorter than that total length, because much of it is made up of the slender tentacles and eight shorter arms. All ten limbs are lined with toothed suckers that grip struggling prey. Beneath the arms sits a sharp, parrot-like beak driven by a muscular tongue covered in tiny teeth.

## The largest eyes in nature

The giant squid has the biggest eyes of any known animal, each roughly the size of a dinner plate at up to around 27 cm across. Such enormous eyes gather what little light reaches the deep sea and help the squid detect the faint glow given off by large predators moving through the dark. In an environment where sunlight never penetrates, this exceptional vision is one of its most important senses. It likely uses this early warning to react before a hunting sperm whale gets too close.

## How it swims and hunts

Like other squid, the giant squid swims by jet propulsion, drawing water into its mantle and forcing it out through a flexible funnel to shoot backwards, with fins on the mantle steering and providing slower cruising. Short, powerful jet bursts can carry it at up to 40 km/h (25 mph). It hunts fish and other squid in the deep ocean, seizing prey with the two long tentacles, which end in broad clubs studded with suckers, and drawing the catch back to its beak. The beak slices food into pieces small enough to pass down its narrow throat.

## Life in the deep ocean

Giant squid live in deep waters across the world's oceans, typically hundreds of metres down along continental and island slopes where cold, dark, high-pressure conditions prevail. They are rarely seen alive and much of what we know comes from carcasses washed ashore or brought up in fishing nets. Estimates suggest they live only around five years, growing very rapidly to their huge size in that short span. Because they inhabit such remote depths, many details of their behaviour remain a mystery.

## Predators and the sperm whale

The chief natural enemy of the giant squid is the sperm whale, which dives deep to hunt them, and the circular scars left by squid suckers are often found on the skin of these whales. Younger and smaller giant squid are also taken by deep-diving fish and sharks. Evidence of the squid's diet and its role in the food web comes largely from the remains found in the stomachs of sperm whales. These encounters between two of the ocean's giants have fuelled sea-monster legends for centuries.

## Legends and discovery

For generations the giant squid was known mainly from beach-cast bodies and tangled sailors' tales, and it is widely thought to be the origin of the mythical kraken. It was not until 2004 that scientists first photographed a live giant squid in its natural deep-sea habitat, and the first video footage came a few years later. These rare glimpses transformed a creature of folklore into a genuine subject of study. Despite its elusiveness, the giant squid is currently assessed as Least Concern.

## Frequently asked questions

### How big is a giant squid?

A giant squid can reach around 13 m (43 ft) in length including its two long feeding tentacles, and can weigh in the region of 275 kg. Much of that length is tentacle and arm; the main body, or mantle, is considerably shorter.

### How does a giant squid move?

It swims by jet propulsion, drawing water into its mantle and squeezing it out through a funnel to shoot backwards. Fins on the body handle slower cruising and steering, while short jet bursts can reach up to 40 km/h (25 mph).

### What do giant squid eat?

Giant squid are carnivores that hunt deep-sea fish and other squid. They grab prey with their two long tentacles, hold it with sucker-lined arms, and cut it up with a sharp, parrot-like beak before swallowing.

### Does the giant squid have the biggest eyes of any animal?

Yes. The giant squid has the largest eyes of any known animal, each about the size of a dinner plate at up to roughly 27 cm across. These huge eyes gather faint light in the dark deep sea and help it spot approaching predators such as sperm whales.

### What eats a giant squid?

The main predator of the adult giant squid is the sperm whale, which dives deep to hunt them. Younger and smaller individuals are also eaten by deep-diving sharks and large fish.

### Are giant squid dangerous to humans?

Giant squid pose little danger to people because they live in the deep ocean, hundreds of metres down, and almost never encounter humans. Their fearsome reputation comes largely from old kraken legends rather than any real threat.

## Sources

- [IUCN Red List — Architeuthis dux.](https://www.iucnredlist.org/search?query=Architeuthis%20dux&searchType=species)
- [Animal Diversity Web — Architeuthis dux. University of Michigan Museum of Zoology.](https://animaldiversity.org/accounts/Architeuthis_dux/)
- [Wikipedia — Giant Squid.](https://en.wikipedia.org/wiki/Giant_squid)

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Source: Global Animal Guide (https://globalanimalguide.org/animals/squid/). Licensed CC BY-NC 4.0 — free for non-commercial reuse with attribution.