Serving to promote a more accurate representation of mustelids in media.
Plantar Glands
Hind paw of a fisher (Pekania pennanti)
Similar to most marten species, the fisher has plantar glands within whorls of hair on their hind paws that emit a distinctive odour.(1)(2)(3)(4) The hairs appear as small dark circular patches on the large segmented centre pad (known as the metacarpal pad).
The plantar glands of pregnant female fishers enlarge to >10mm during January through May, and reduce in size (<10 mm) during June after giving birth. On males, the glands increase in size from <15 mm in December to >30mm in May. Reduction of the gland size is complete by June. Because these glands enlarge near and during mating season, it is hypothesised they serve the purpose of creating a trail of scent for fishers to locate each other for mating.(3)
References
Buskirk, Steven W., P. F. A. Maderson, and Robin M. O’Connor. “Plantar glands in North American mustelidae“. Chemical Signals in Vertebrates 4: Ecology, Evolution, and Comparative Biology (1986): 617-622.
Powell, R. A., S. W. Buskirk, and W. J. Zielinski. “Fisher and marten: Martes pennant and Martes americana“. Wild mammals of North America: Biology, management and conservation. John Hopkins University Press Baltimore, 2003. 635-649. pp. 636-639.