In many parts of the world, leeches are surprisingly common. You can find them in Amazon jungles, but you can also find them in the local lake. They can be found in swimming in water or crawling on land. For example, if you jump to the 40-second point of this video, Neil deGrasse Tyson shows how common leeches are in a Connecticut pond. Leeches are also voracious feeders. They quickly attach and start sucking. They fall off on their own eventually, but since some leeches can be as big
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