The beaver sex

The Methow Project, as I reported this month for High Country News , captures tree-felling, ditch-clogging nuisance beavers in eastern Washington and relocates them to public lands in the Cascades. There, the buck-toothed engineers construct salmon-sheltering wetlands, recharge groundwater and create habitat for wildlife from salamanders to moose. In between live-trapping and release, the Project houses its wards at the Winthrop National Fish Hatchery , where males and females form pair-bonds that help them better survive in the wild. Beavers, you see, lack familiar mammalian plug-and-socket genitalia. Instead, the creatures possess cloacas — fleshy vents, analogous to the anatomy of birds and reptiles, that do triple duty in the departments of waste disposal, scent secretion, and, yes, reproduction. Not even the sharpest-eyed matchmaker can reliably tell the sexes apart — at least not visually.
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06.11.2020
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The Secret Sex Lives of Beavers

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The Secret Sex Lives of Beavers | Bostonia | BU Alumni Magazine

Frank Rosell, Bruce A. Scent marking is a common form of territorial demarcation in mammals and differential marking by the sexes may select for differences in scent gland developmental rates or size. Rates of marking reflect level of defense and so behavioral dimorphism in marking by the sexes may select for dimorphism in scent structures. Eurasian beavers Castor fiber are monogamous, territorial mammals that show some behavioral dimorphism in territoriality. Beavers have 2 primary scent structures, anal glands and castor sacs.
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How do you sex a beaver? Squeeze and sniff

Back in we successfully campaigned to get beavers returned to the wild in Devon. Where they're allowed to get on with it, these amazing creatures can do a huge amount to help nature — improving the local habitat that provides a home for other species. Beavers are just one of the precious parts of nature we want to protect in the British countryside.
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