Head to head
Earless Monitor vs Nile Monitor
The earless monitor and the Nile monitor sit at almost opposite ends of what it means to be a monitor lizard, one a secretive, poorly known rarity from a single Bornean river system, the other a large, aggressive, wildly successful predator found across an entire continent and now beyond it.
| Earless Monitor | Nile Monitor | |
|---|---|---|
| Family | Lanthanotidae (sole member) | Varanidae |
| Typical size | Small, under 50 cm | Often well over a metre |
| Range | A single river system in Borneo | Most of sub-Saharan Africa |
| Lifestyle | Secretive, semi-aquatic, burrowing | Bold, active, wide-ranging |
| External ears | Absent entirely | Present |
| Conservation status | Data Deficient | Least Concern |
| Invasive elsewhere | No | Yes, established in Florida |
| Public familiarity | Very low, once thought mythical | High, well documented |
Earless Monitor vs Nile Monitor: common questions
Are the earless monitor and Nile monitor closely related?
Not especially, despite both being loosely referred to as monitors. The earless monitor is the only living member of its own distinct family, Lanthanotidae, an ancient lineage with no close living relatives, while the Nile monitor belongs to the much larger family Varanidae, which includes dozens of species commonly called true monitors, including the Komodo dragon. Their shared informal grouping under the monitor name reflects loose historical classification more than a particularly close evolutionary relationship.
Why is the earless monitor so much harder to find than the Nile monitor?
The earless monitor is restricted to a very narrow range of clear forest streams on the island of Borneo and spends much of its life hidden in burrows or submerged vegetation, making it genuinely difficult to survey even with deliberate effort. The Nile monitor, by contrast, is a bold, actively foraging lizard found across a huge swath of sub-Saharan Africa in a wide range of habitats, making it a far more commonly encountered and thoroughly studied animal by comparison.
Could the earless monitor ever become as widespread as the Nile monitor?
This seems unlikely given how different the two species are ecologically, since the earless monitor's specialised, secretive, semi-aquatic lifestyle and extremely narrow natural range are tied closely to a specific stream habitat type, unlike the Nile monitor's much more generalist diet and tolerance for a wide range of conditions, traits that have made the Nile monitor successful even as an introduced species far outside its native Africa. The earless monitor's far more specialised biology makes this kind of broad ecological success considerably less probable.