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BioRender Template
Why Are Some Canadian Squirrels Black?
Description
This template was adapted from the original submission. Edits were made to enhance scientific accuracy, optimal usability and/or to meet industry-leading design standards for science communication.
The melanocortin-1-receptor (MC1R) is involved in regulating the production of melanin. In North American squirrel populations, a specific mutation in the MC1R gene (MC1RΔ24) maintains the active state and promotes the production of eumelanin, resulting in dark colouration. The mutation likely appeared first in fox squirrels before being spread to gray squirrels through interbreeding.
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