Dumbo Octopus

The name comes directly from its most obvious feature — two large, rounded fins that project from the sides of its mantle just above its eyes, which flap gently as it moves and closely resemble the oversized ears of Disney's animated elephant character. Marine biologists who first observed these deep-sea octopuses noted the resemblance immediately, and the nickname stuck so firmly that it is now the standard common name used even in scientific contexts, alongside the more formal genus name Grimpoteuthis. Several distinct species share this fin arrangement and the "dumbo" name, differing mainly in size, coloration, and exact depth range.

It lives deeper than almost any other known octopus, with most individuals found between roughly 1,000 and 4,000 metres below the surface, and some records extending even deeper, close to 7,000 metres in a few studies. At these depths sunlight never penetrates, water temperatures hover just above freezing, and pressure is many hundreds of times that at the surface, conditions that would be lethal to most shallow-water marine life. This extreme depth range is a large part of why dumbo octopuses remain poorly studied compared to their shallow-water relatives, since observing them requires deep-sea submersibles or remotely operated vehicles rather than simple diving.

Unlike most octopuses, which typically crawl along the seafloor or jet through the water by forcefully expelling water from their mantle, the dumbo octopus relies mainly on its two large ear-like fins, flapping them in a slow, graceful rhythm to hover and glide through open water. It supplements this fin-based movement with small pulses from its webbed arms, which can also spread out like an umbrella to help it control direction and briefly increase lift. This combination produces a distinctive, almost balloon-like swimming style very different from the fast, jet-propelled dashes typical of octopuses living in shallower, more predator-rich waters.

It feeds on small invertebrates found on or drifting just above the deep seafloor, including copepods, isopods, amphipods, worms, and other small crustaceans, which are relatively scarce at these depths compared to shallower waters. Rather than actively chasing prey, the dumbo octopus is thought to hover close to the bottom and pounce directly onto items it detects, engulfing them whole within its webbed arms and mantle, since deep-sea prey items are usually soft-bodied and small enough not to require the tearing bite that shallow-water octopuses use with their beaks. This low-energy hunting style fits an environment where food is limited and energy conservation matters more than speed.