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'Penis bones': An evolutionary puzzle explained using innovative 3D scanning

Sep 29, 2018 - 10:30 AM

It has always been a bit of mystery as to why some species of male mammals evolved bones in their penises

3D finite element models of carnivore penis bones - from top to bottom: tiger, brown bear, wolf, polecat. Not to scale. Hot colours indicate regions bone areas that are highly stressed. Cool colors indicate bones that are less stressed (more robust). Charlotte A. Brassey, Author provided