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Gross science: This parasite crawls into a fish's mouth and replaces its tongue. Enough said.

Note: In this video, we refer to the parasites as "protoandritic." The real word is "protandric." We take accuracy very seriously and we apologize for the error. Thank you to the viewer who pointed this out.

Creature Eats and Becomes Fish Tongue. One of the more bizarre animals roaming around our oceans, this parasitic crustacean not only eats the tongues of fish but also then replaces it. It's chilling to think about, but surprising the fish endures and often resumes a somewhat normal life. Come learn a bit about the Tongue-Eating Louse.

Symbiosis is close and often long-term interaction between different biological species.

The definition of symbiosis is controversial among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to all types of persistent biological interactions (i.e. mutualistic, commensalistic, or parasitic).

In this video we show how you can simply visualize all three.

A nice collection of video links about the three types of symbiosis -- mutualism, parasitism and commensalism.

Ticks can attack moose in droves, draining their blood and possibly killing them.