Head to head
American Marten vs Fisher
The American marten and fisher are close relatives sharing dense northern forest habitat, but they differ substantially in size, prey, and just how tolerant each is of forest disturbance.
| American Marten | Fisher | |
|---|---|---|
| Scientific name | Martes americana | Pekania pennanti |
| Relative size | Smaller | Larger |
| Habitat sensitivity | Highly dependent on old-growth forest structure | More tolerant of varied forest conditions |
| Notable hunting skill | Agile pursuit of squirrels through canopy | One of the few predators able to kill a porcupine |
| Delayed implantation | Yes | Not typically emphasised |
| Historical fur trade pressure | Yes | Yes |
| Conservation status | Least Concern | Least Concern |
| Diet | Carnivore | Carnivore |
American Marten vs Fisher: common questions
Which is bigger, the American marten or the fisher?
The fisher is considerably larger than the American marten, a size difference that also shows up in diet and hunting ability, since the fisher's greater size and strength allow it to take on prey as formidable as a porcupine, something the smaller marten does not attempt.
Why is the American marten so sensitive to logging compared to the fisher?
The American marten depends closely on the complex structure of old-growth forest, including fallen logs and standing dead trees that take many years to develop, and can disappear from a logged area even when prey remains plentiful, while the fisher tolerates a somewhat wider range of forest conditions.
Do both the American marten and fisher hunt in trees?
Yes, both species are agile climbers capable of pursuing prey such as squirrels through the forest canopy, though the fisher's larger size and strength additionally allow it to take on ground-based prey, including porcupines, that the smaller American marten would not attempt to hunt.