The Humboldt squid is a fierce, color-shifting predator that dominates global commercial squid fisheries.

Nature · Published 3 October 2026 Swipe more like this →

In short: Known as the red devil, this massive cephalopod thrives in the eastern Pacific. It uses rapid skin flashes to communicate and hunt in shoals, while its unique physiology and aggressive reputation have made it both a subject of intense scientific study and a staple of international seafood markets.

The Humboldt squid, or Dosidicus gigas, is a formidable predator reaching mantle lengths of 1.5 meters and weights up to 50 kilograms. Native to the eastern Pacific from Tierra del Fuego to California, these invertebrates are famous for their rapid color changes, known as metachrosis. By flashing red and white at frequencies of 2 to 4 Hz, they signal to other squid, while a slower flickering pattern serves as dynamic camouflage against sunlight filtering through the water.

These squid are highly opportunistic carnivores that hunt in shoals of up to 1,200 individuals. Their feeding behavior is notoriously aggressive, involving cannibalism and the use of barbed tentacles to secure prey, which is then shredded by a powerful beak. While they have a reputation for attacking humans, some researchers suggest this aggression is primarily linked to feeding times or provocation by artificial light and reflective gear. Their lifespan is short, typically lasting only one to two years.

Commercially, the Humboldt squid is the most important squid species worldwide, accounting for a third of all squid hunted as of 2019. They are primarily caught via jigging, a method using light to lure them toward the surface. Because their flesh is saturated with ammonium chloride, it requires specialized processing—including tenderizing and acid soaking—to become palatable. Despite their economic value, their populations are sensitive to environmental shifts, such as El Niño events and warming waters, which can alter their migration patterns and distribution.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• How squids use extraordinary adaptations to thwart ocean predators
• The terror of the deep: how the Humboldt squid hunts in packs
• The giant Pacific octopus is a master of camouflage that can hunt sharks
• The terrifying reality of cephalopod attacks and maritime myths
• How do the world's largest invertebrates survive in the lightless, crushing deep ocean?
• A moth that hovers and hums like a hummingbird, yet evolved entirely separately
• Our earliest ancestors may have been less like chimpanzees than assumed
• Bubble-net hunters that sang their way back from five thousand
• A Wembley derby emptied Hull so completely that a sign asked for lights off
• Some huntsman spiders cartwheel down dunes, and one tick like a quartz clock
• The Aztec sun god whose name contains a hummingbird, and whose dead became hummingbirds
• The hyacinth macaw's survival depends on a toucan that also eats its eggs

More in Organisms · More in Nature · Latest · A–Z · All topics