Amphibians
Northern Dusky Salamander
Desmognathus fuscus · also called northern dusky salamanders
Along the damp bank of a small forest stream, a northern dusky salamander holds its distinctively flattened, knife-edged tail still while it waits for a passing insect, one of the more terrestrial members of a genus otherwise known for staying almost entirely in the water.
Overview
The northern dusky salamander, Desmognathus fuscus, is a lungless amphibian native to the banks of small, clean forest streams, seeps, and springs across a broad range of the eastern United States and southeastern Canada. Its distinctive knife-edged tail, semi-terrestrial habits within an otherwise highly aquatic genus, and broad geographic range make it one of the more widely encountered stream salamanders in eastern forests.
A relative that spends a bit more time on land
While many of its closest relatives stay almost entirely within flowing water, the northern dusky salamander has carved out a slightly more terrestrial niche along the damp banks nearby, without ever losing its fundamental dependence on consistent moisture.
Status
Least Concern — widespread and abundant across suitable forest stream habitat throughout the eastern United States and southeastern Canada.
Northern Dusky Salamander: common questions
How can you identify a northern dusky salamander?
Look for a distinctively vertically flattened, knife-edged tail profile combined with a pale line running from the eye down to the corner of the jaw, features that together help distinguish this species from several similar-looking stream salamander relatives sharing the same forest stream habitat.
Is the northern dusky salamander fully aquatic?
Not entirely; compared with some of its close relatives that remain almost constantly in flowing water, this species spends more time on damp streamside banks and the nearby forest floor, though it never strays far from moisture since, like all members of its family, it has no lungs and must keep its skin consistently damp to breathe.
How widespread is the northern dusky salamander?
This species has one of the broader ranges among stream-dwelling salamanders in its genus, found across a wide stretch of the eastern United States and southeastern Canada, a distribution considerably broader than several of its more range-restricted relatives found only in specific mountain regions.
What does the northern dusky salamander eat?
This species feeds on insects, spiders, worms, and other small invertebrates found along stream banks and within moist forest floor debris, hunting primarily at night when humidity is higher and its invertebrate prey is more active and accessible.