When a South Dakota couple began bottle-feeding an orphaned litter of kittens just two weeks ago, they didn't expect to become the center of a viral cat sensation.

But the striking size difference between two littermates—one a fragile runt, the other described as "an absolute brick of a kitten"—has captured viral attention online.

On Reddit 's popular r/cats forum, the foster posted a picture of Fleece, the smallest of the litter, alongside her much-larger brother, Flannel. Their sisters, Cotton and Sherpa, fall somewhere in between, but the picture of the size difference between Fleece and Flannel melted hearts online.

"One is a runt and the other is whatever the opposite of runt is," the caption said on the Reddit post that now has more than 70,000 upvotes. At just 4 to 5 weeks ol

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