Red Lipped Batfish: The Walking Fish at 76 m Deep

The red lipped batfish (Ogcocephalus darwini) is a bizarre Galapagos fish that walks on the seabed instead of swimming, wearing what looks like bright red lipstick. Endemic to the islands and named after Charles Darwin, it is one of the ocean’s strangest-looking animals. Here is what it is, why it has red lips, and where divers find it.

Red lipped batfish at a glance

• Scientific name: Ogcocephalus darwini (the galapagos batfish)
• Size: about 25-35 cm long
• Depth: roughly 3 to 76 m, on sandy and rocky bottoms
• Range: around the Galapagos Islands and off Peru and Ecuador
• Diet: small fish, crustaceans and molluscs
• Status: harmless to humans; not poisonous
• Famous for: bright red lips and “walking” on leg-like fins

What is it?

The red lipped batfish is a small, flattened bottom-dwelling fish endemic to the Galapagos and nearby Pacific waters. Its scientific name, Ogcocephalus darwini, honours Charles Darwin. It has an almost grumpy face, a horn-like snout, a fringe of “whiskers” and those unmistakable scarlet lips. It is one of roughly 60 species of batfish worldwide, but none is quite as photogenic. Planning a trip around what you want to see? Tell us your dates and we’ll send a free quote within 24 hours.

Why the red lips?

Nobody is completely sure — and that mystery is half the fun. The leading theory is that the bright lips help these fish recognise and attract mates in the dim light of the seabed, acting as a visual signal between individuals of the same species. They are not a warning and not venomous; they are most likely the fish’s version of a name tag in the gloom.

The fish that walks, not swims

With a flattened body and a reduced swim bladder, the red lipped batfish is a famously poor swimmer. Instead of gliding, it has modified pectoral and pelvic fins that work like stubby little legs, letting it “walk” or hop slowly across the sand. Watching one waddle along the bottom is one of the great oddities of Galapagos diving.

A relative of the anglerfish

Like the deep-sea anglerfish, it is an ambush hunter with a built-in fishing rod. On its head sits a small retractable lure called an illicium, tipped with a fleshy esca that it wiggles to draw small fish, crustaceans and molluscs within striking range. Beneath the funny face is a patient, efficient predator.

The galapagos batfish and its clever camouflage

The galapagos batfish plays a clever double game. Seen from above — the angle of most predators — its mottled brown back blends into the sandy seabed. Seen face-to-face, those red lips and odd features make it unmistakable. That dual strategy is part of why the species is so striking up close. You can see this on our 5-day San Cristobal tour.

Red Lipped Batfish Galapagos Range: Where to See It

It takes a dive and a sharp eye. The red lipped batfish galapagos populations rest on sandy patches between rocks, usually below snorkelling depth:

• Dive sites with sandy bottoms — around Santa Cruz, San Cristobal, Floreana and Isabela.
• Roughly 3 to 76 m deep — most sightings are on scuba, not snorkel.
• Look low and slow — it sits still on the sand, relying on camouflage.

Quick facts

A few more red lipped batfish facts to remember:

• Its scientific name is Ogcocephalus darwini, named after Charles Darwin.
• It is endemic to the Galapagos and nearby Pacific waters.
• It walks on leg-like fins instead of swimming.
• Its red lips most likely help it recognise and attract mates.
• It is a relative of the anglerfish and uses a lure to hunt.

How the red lipped batfish hunts and breeds

As a member of the anglerfish family, the red lipped batfish carries a small retractable lure called an illicium on its forehead, tipped with a fleshy esca. It wiggles this lure to draw small fish, crustaceans and worms within reach, then ambushes them — a slow, deliberate hunter rather than a chaser. Unlike deep-sea anglerfish it does not light up; on the dim, sandy seabed it relies on that twitching bait and on chemical cues to find prey.

The species ranges across a wide depth band, from roughly 3 metres down to about 120 metres, which is exactly why snorkellers almost never meet it and divers treasure a sighting. It is not currently considered threatened, but its narrow Galapagos-and-northern-Peru range and its reliance on healthy sandy bottoms mean it benefits directly from the marine reserve’s protections. Its breeding, lifespan and movements are still poorly documented, so every careful diver observation adds to what science knows about this odd little walking fish.

Ogcocephalus darwini: naming and relatives

The scientific name ogcocephalus darwini honours Charles Darwin, whose Beagle voyage put these islands on the scientific map. It places the fish in the batfish family (Ogcocephalidae), a group of bottom-dwelling relatives of the anglerfishes. Like its cousins, it swapped fast swimming for a stranger talent: walking. Its pectoral and pelvic fins have evolved into stiff, arm-like limbs that prop it up and shuffle it across the sand, so it spends almost all its time on the seabed rather than in open water.

Within the genus there are several batfish across the tropical eastern Pacific, but ogcocephalus darwini is the one with the famous scarlet lips and the tightest tie to the Galapagos. Researchers still debate what the red lips are for — the leading ideas are species recognition (so the fish find the right mates in murky water) and a courtship signal. What is clear is that the colour is not camouflage; everything else about the fish is built to disappear into the sand, which makes the bright mouth all the more puzzling.

Galapagos batfish habitat and range

The galapagos batfish lives on sandy and rubble bottoms around the archipelago and along the northern coast of Peru, generally between about 3 and 120 metres deep. It favours flat, open seabed near reefs and walls, where it can sit motionless and wait for prey to wander past. Because it prefers deeper sand than most snorkelling sites reach, the vast majority of sightings come from scuba divers working the bottom on sites such as those around Wolf and Darwin, Cousins Rock and the channels off Santa Cruz and Isabela.

It is a poor swimmer, so it does not migrate far; a single fish may spend its whole life on one stretch of seabed. That makes the health of the sandy-bottom habitat — and the protection of the Galapagos Marine Reserve — central to its future. It is not currently listed as threatened, but its small range and sedentary habits mean local disturbance, trawling pressure outside the reserve, or changes to the seafloor could hurt it quickly.

Red lipped batfish facts every diver should know

A few extra red lipped batfish facts help you appreciate one when you find it. It is small — usually 25 to 35 cm — with a flattened, disc-shaped body, a horn-like projection above the snout, and that retractable lure tucked beneath it. It is completely harmless to humans and has no venom; the “weird and creepy” reputation it earns in pop-science listicles is entirely undeserved. Approached calmly it will often hold its ground, letting patient divers watch it walk and even “yawn”.

Good dive etiquette matters: never lift, chase or corner it, keep your fins clear of the sand so you don’t bury it in silt, and let it move on its own terms. These are the small courtesies that keep the red lipped batfish galapagos divers travel so far to see exactly where it belongs — calm, curious and undisturbed on the open seabed.

So strange is its appearance — the pouting scarlet lips, the stubby walking fins, the grumpy expression — that many people meeting a photo for the first time assume it has been digitally invented. It has not. This is a genuine, living endemic, photographed and filmed many times on the seabed here, and one of the real wonders of the islands’ underwater world. Juveniles even look a little different, longer-bodied and less disc-shaped, growing into the famous flattened, big-lipped form only as they mature.

Frequently asked questions

Meeting the ocean’s walking oddity

The red lipped batfish is proof that the Galapagos hides its weirdest wonders underwater. Spot one walking the sand on a dive, red lips and all, and you have met one of the strangest, most charming fish in the sea.

Read more at the Galapagos Conservation Trust, or meet more underwater life in my guide to Galapagos sharks and the rest of the cast in Galapagos islands animals.

Header photo: jeyre, CC BY, via iNaturalist.