| The bizarre, microscopic flatworm Ribeiroia ondatrae infects a chain of hosts to spread its genes. A hijacked snail floods a pond with flatworm larvae, which dig into tadpoles and cause them to sprout too many legs. As adults, the clumsy frogs prove easy prey for herons, whose droppings will spread the parasite far and wide.
Meet more mindsuckers - 01:29
Read about parasites online in National Geographic magazine:
http://goo.gl/dG6uRp
SENIOR VIDEO PRODUCER AND EDITOR: Hans Weise
ART AND ANIMATION: Matthew Twombly
ADDITIONAL AUDIO RECORDING: Daniela Santamarina
SOURCE: Pieter Johnson Lab, University of Colorado, Boulder
NARRATOR: Sean O'Connor | 
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