Abstract
The volume of the morrillo (snout scent-gland) of adult capybara (Hydrochaeris hydrochaeris) males was found to correlate significantly with testes mass (r = 0.359, d.f. = 110, P < 0.0001). This was independent of body size. Males in better condition did not have larger testes or morrillos, whereas age did correlate with size of the morrillo and testes. These results were related to the higher rates of scent marking and reproductive success of dominant males reported in previous studies.
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