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Later, Frankie, the recovered Afghan hound, and her littermate Belle stood side-by-side in their breed’s ring.

Then-Red Sox infielder Ian Kinsler also adopted a littermate.

Four months later, his littermate, Jessie, was diagnosed with head and neck cancer.

Once a cub has been tackled by its littermates, roles might reverse such that a littermate handicaps itself, allowing the other cub to tackle it in return.

N184 was first recruited for the study as a cub when her mother and a female littermate lived in the same area of Haw Creek.