The fisher is an agile tree climber, tends to live a somewhat solitary existence. There is evidence that fishers hardly ever travel together, except during the mating season, Found only in North America, The fisher prefers continuous forests that offer the opportunity to den in hollow trees. The sagittal crest of a fisher's skull can illustrate the strong sexual dimorphism between males and females of the species.
- The male skull has some damage on the right side of the parietal and the left auditory bullae
- The female skull has clay in all the natural holes in the skull. This skull was used for casting a mold.
- Male Skull Length 13cm (5.1in)
- Male Skull Width 7.2cm (2.8in)
- Male Skull Height 5.1cm (2in)
- Female Skull Length 10.6cm (4.2in)
- Female Skull Width 5.4cm (2.1in)
- Female Skull Height 4.3cm (1.7)