Komodo dragons were nearly mythical creatures until the first detailed field study was conducted by Walter Auffenberg in the late 1960s. Their dinosaurian appearance combined with the remoteness of their natural habitat made them a dream species for hardcore wildlife enthusiasts, and the dream acquisition for many zoos. These days they have been exported to zoos in many countries, have been bred in captivity, and have been the subject of much field and captive research. 

The experience of seeing these giant lizards in the wild has changed a lot too. In past decades, those intrepid tourists who made it to Komodo gathered at a makeshift amphitheater where park guards had tied a goat to a stake. The dragons had become accustomed to the grisly ritual. They would stalk excitedly from the forest, scaly tails dragging and long forked tongues flicking, to descend upon the hapless goat, setting off a truly gruesome feeding frenzy. As I explained to [my] tour group as we were en route to the island, such grisly spectacles were a thing of the past. Or at least I thought they were.

The Komodo dragon is a monitor lizard of the genus Varanus. The group of 80-some species has ancestors going back tens of millions of years, originating in Asia. Today, the group has a wide distribution across Africa, Asia, and the Australia-Oceania region. The lizards range in size from less than a little more than 1.6 feet (0.5 m) in length to the Komodo dragons’ ten-plus feet (3 m). Some of the larger species are highly aquatic, while others are powerful burrowers. Nearly all species are carnivorous. What factors drove the evolution of gigantic size in the dragons? Many biologists have noted that on offshore islands, reptiles sometimes evolve to large size and take the place of large warm-blooded animals that either never reached the island or would not be able to find enough food to sustain themselves. Going for weeks without finding enough food would be fatal for a mammalian predator the size of a Komodo dragon. For these ectothermic giant lizards, it is no big deal. So the Komodo Dragon evolved into an apex predator.

Komodo Island itself has become a stopover for cruise ships traveling between major ports like Singapore and Australia. The Indonesian government enabled this by building a deep-water harbor and long dock so that large ships can discharge passengers for a couple of hours ashore. This has turned the ecotourism experience, once such a rarely visited locale, into a mass tour group nightmare.

Thankfully, Rinca, the other islet on which dragons can be easily seen, remains a quieter place. Our little transfer boat slid up to an old wooden dock, amid a group of chattering long-tailed macaques bouncing in the mangroves surrounding it.

We were taken to an orientation session and then split into small groups. My daughter, enjoying her college graduation travel gift with me, loved the snorkeling and beach resort time but seemed a bit anxious about encountering huge carnivorous lizards in the forest. We found them everywhere, including lolling casually around the tourism center‚ lounge lizards on a grand scale.

Our little group followed a guide along a winding trail through brushy forest. The islands are not covered by a vast primeval forest. They are a mix of grassland and tropical dry forest, with some wetter monsoonal forest higher in the hills. The dragons stalk the island, flicking their huge tongues in hopes of picking up the scent of a deer, wild boar, or water buffalo — the latter two species introduced by humans — or rodents and other smaller reptiles, including baby Komodo dragons.

We paused when the guide spotted a Draco — a flying lizard — on a tree trunk. A petite creature with a ribcage from which extend winglike flaps that allow it to launch itself from a tree and glide to safety, it’s an iconic animal of the region, a miniscule distant relative of a dragon.

Then the surprise. We arrived at a clearing in which three goat carcasses had been freshly hung from trees. Despite my declaration to the tourists onboard that the dragons’ goat slaughter spectacles were a bygone thing, an Indonesian government VIP was on the island that day, and to give him a show, the national park staff had brought the goats. Their throats slit, they were strung up a few feet off the ground, looking for all the world like hairy, horned piñatas. And to a Komodo dragon, that is exactly what they were.

By the time we arrived, shortly after the goats had been hung up, dragons were already appearing. In no time more than a dozen dragons were lunging up at the carcasses, tearing off chunks and lashing out at competing toothy mouths around them. Most of the beasts were in the six and a half to ten feet (2–3 m) range. A few males were eleven and a half feet (3.5 m) long. Juvenile dragons merely 3.3 feet (1 m) long were drawn to the goat carcasses too, but they stayed on the periphery of the melee lest they themselves became a meal.

The feeding frenzy went on for 40 minutes or more until the guide indicated that it was time for us to move on. But the group wasn’t about to leave this spectacle. They demanded to stay and watch, enthralled. Even my daughter was more fascinated than horrified. It was a nature-red-in-tooth-and-claw moment. Only when the last goat parts were gone, and the dragons’ bellies were distended with meat, did they wander off, leaving the little dragons to race in to pick at the scraps. Only then did we walk on, knowing anything we saw in the forest would pale compared to the memory of this horrific feast.

In addition to its other outsized traits, the Komodo dragon is the largest venomous animal on the planet. Since its discovery, there was a belief that the bite of a Komodo could be lethal because it was said that, in addition to its potential to inflict severe lacerations, the animal’s saliva was so bacteria-laden that infection and septicemia could disable or kill a deer or buffalo. In fact, the bacterial load of a dragon’s mouth is comparable to that of other lizards and to the bodies of their prey.

Even if the bacterial infection idea didn’t pass muster, dragons possess venom. Observations of unabated bleeding and shocklike symptoms tipped off scientists that a dragon bite may cause something more than just tissue damage and blood loss. The jaw of a dragon possesses a venom gland with ducts that open between multiple teeth, delivering a potent venom into the bite site. The venom causes a drop in blood pressure in the prey as well as prolonged bleeding, immobilizing it and allowing the dragon to bring it down and kill it. We didn’t see it happen, but we watched a recently shot video of a deer standing motionless in the forest, trembling and ailing, while a dragon approached and dispatched it. The dragon had been following its prey’s trail since it had attacked and bitten the deer hours earlier.

The Komodo dragon, among the world’s most iconic animals and now a major ecotourist attraction for Indonesia, clings to a precarious existence in its island realm.

Komodo dragons are larger than life lizards living on remote islands. But the modern dragon has an extinct relative, Varanus priscus, that was much larger, likely the largest venomous animal to have ever lived. The dragons have a colorful history. Tens of thousands of years ago, they inhabited a larger part of the region around the island of Flores. Excavations in Liang Bua cave on Flores in 2003 discovered a tiny species of human that rocked the world of human origins. Homo floresiensis, nicknamed the Hobbit because of its tiny size, was a small-brained primitive little early human that lived tens of thousands of years ago on Flores at the same time that fully modern people also inhabited Indonesia. It’s hard to wrap our minds around two fully separate species of human coexisting, but they did. The little Hobbits made stone tools and hunted a small species of ancient elephant that lived on the island. They also may well have eaten (and perhaps been eaten by) Komodo dragons, evoking a very Game of Thrones image.

Today, monitor lizards are considered to be among the most intelligent of all cold-blooded animals. Komodo dragons recognize individual keepers. They have also been shown to exhibit play behavior with objects in their enclosures, highly unusual behavior for a reptile. Play is not an easy concept to define. We all know it when we see it, but objectively describing play is another thing. Mammals engage in social play and object play. Komodo dragons in the National Zoo in Washington, DC, interact with novel objects in their enclosures — pieces of wood, balls, soda cans, cardboard boxes — with an intense curiosity more befitting a dog than other lizards. It may be that object curiosity is associated with predatory animals, like dogs, cats, and dragons, which makes interacting with, nuzzling, and playing with objects, animate or inanimate, a natural behavior.

Back on Rinca we left the dragon feeding frenzy and saw more dragons stalking the forest floor, tongue-flicking in search of food. They were digging out the burrows where they sometimes hide and where females lay eggs. And they were lying in wait, seemingly at rest but always alert to the possibility of unsuspecting prey walking by. As of 2025, the Komodo dragon population of Komodo National Park was estimated at only 1,400 adults. They were officially uplisted from Vulnerable to Endangered by the International Union for the Conservation of Nature. Although the population size seems to be stable, threats from climate change — rising ocean levels surrounding small islands — and from the ongoing loss of their habitat to human development will take a toll on their already fragile island worlds over the coming decades. The Komodo dragon, among the world’s most iconic animals and now a major ecotourist attraction for Indonesia, clings to a precarious existence in its island realm.