Mole skull and paw showing 6th digit, X-ray

  • Chris Thorn xrayartdesign.co.uk
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Mole skull and paw showing 6th digit, X-ray. Chris Thorn xrayartdesign.co.uk. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.

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Direct X-ray projection of a mole (Talpa europaea) skull and paw onto Fine-Grain X-ray film. The projection was then enlarged from 50 mm to 150 mm using a Microfocal X-ray. Moles are mammals which spend most of their time burrowing tunnels underground. They have a 6th digit on each front paw which is in fact a wrist bone which has extended like a claw. It is thought to develop later than the other 5 digits and helps the mole dig.

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