Animal or Food? This Meme Sweeping the Internet Will Leave You Stumped

— -- A series of photos by Twitter user “teenybiscuit” have thousands asking: Animal or food?

Karen Zack, the 25-year-old behind the popular memes, told ABC News that everything started with the collection of cute animal pictures she'd amassed on her phone over time.

"When I zoom out to look at the collections altogether, I begin to notice patterns similar to other things, in this case mostly food," said the Portland, Oregon, resident.

Zack posted the first photo on Twitter in November, asking: Duckling or plantain? "I laughed so hard at the first one I just kept it up simply for my own entertainment," Zack said.

She posted a “shrew or kiwi” photo a few weeks later, but the memes didn't really take off until recently, when she began posting photos comparing canines to carbs.

Featuring curly-haired Labradoodles vs. fried chicken, wide-eyed Chihuahuas vs. muffins, and grain-colored puppies vs. bagels, the revolutionary comparisons have been retweeted tens of thousands of times on Twitter and garnered hundreds of thousands of views on sites like Reddit and Imgur.

"I was so shocked to see them go viral, on [International Women's Day] no less," Zack said. "It's exciting to be recognized for making people laugh."