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To learn more about Blepharisma check out the full video here: https://youtu.be/N6mqpIifiDY

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In the 1930s, the scientist Arthur C. Giese started with a group of Blepharisma that had grown up on bacteria. The Blepharisma he was working with weren't large enough yet to eat each other, but they could eat a ciliate called Tetrahymena that was smaller than them but the larger than bacteria. After eating Tetrahymea the Blepharisma grew. Then, starved of their Tetrahymea diets, the giant Blepharisma were set upon a batch of Blepharisma that were small enough to stuff in their microbial gullet. The smaller Blepharisma, did not stand a chance. Within minutes, most of the giant Blepharisma Giese observed had eaten at least one Blepharisma. Eight hours later, he found one giant had eaten 12!