The Komodo dragon is the only living land animal with a backbone that has true ziphodonty, meaning teeth that are serrated, curved and blade-shaped. Its teeth have true ampullae, which are folds that strengthen the serrations and which are otherwise known only in theropod dinosaurs. The teeth also have only a thin coating of enamel, and orange coatings rich in iron on the serrations and tips help keep their cutting edges. A computer model of the skull estimated a maximum bite force of 39 newtons at the best jaw opening angle, which is an estimate from a model and not a measurement of a living animal.
The venom has a history of its own. A 2009 comparison with Komodo dragon anatomy suggested that an extinct giant monitor lizard, Varanus priscus, which was called Megalania, may have been the largest venomous animal that ever lived. The living dragon has a compound venom gland in its lower jaw, with one large and five smaller compartments, and ducts that open between its teeth. Its venom keeps blood from clotting and lowers blood pressure. Scientists reject the old idea that bacteria in the mouth help the dragon hunt.
The genome adds a great deal more to the picture. Monitor lizards have high aerobic capacity and heart and blood vessel features like those of mammals, and the Komodo dragon genome shows signs of natural selection in genes for energy use, the heart and blood vessels, and blood clotting. Researchers sequenced whole genomes of 24 Komodo dragons from the five main islands. A genome study found that the dragons of Komodo island and of the north coast of Flores should be treated as two separate conservation units. Genetic differences among island groups are thought to come from sea level changes that joined and separated the islands over time.
Females carry a surprise as well, because they can reproduce without a male, in a process called parthenogenesis. Researchers used genetic fingerprinting to show that two zoo females kept away from males had produced offspring on their own. Females that produce young without a male can only produce sons, and a shortage of females in a population has led to evidence of inbreeding. One of the zoo females later produced offspring the usual way too, so females may switch between the two kinds of reproduction depending on whether a mate is there.
Scientists tested a Komodo dragon climate model against occupancy data collected with camera traps. As of 2021, an estimated 3,500 Komodo dragons lived on six islands in Indonesia, and from 1981 to 2021 their numbers dropped from 5,000 to 3,500, which led the IUCN to move the species from vulnerable to endangered. As of 2021, they lived in eight subpopulations on six islands, and almost 70 percent of them were on Komodo and Rinca. As of 2021, only about 10 percent of the dragons on Flores lived inside a protected area.
Young dragons change as they grow. They live in trees and eat mostly insects, and their teeth are not yet the serrated kind that adults have. A dragon uses its long, forked tongue to sample the air, and an adult can smell dead animals up to 4 kilometers away. Komodo dragons were not formally recorded as a new species until 1910, and as of November 2026 the species is listed as endangered. From its teeth to its genes, this lizard lives on a few islands in Indonesia.
Words to know
- ampullae: tooth folds
- theropod: meat-eating dinosaur
- enamel: tooth coating
- genome: all its genes
