RE: Parasitic infection of a single individual can affect an entire group: the case of sticklebacks fish
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Yes, this is one of the biggest mysteries in biology to me, how these parasites can influence the behavior of animals, like the lancet liver fluke (Dicrocoelium dendriticum) infects an ant and manipulates her somehow so that during daytime the ant climbs on the top of a grass blade and convulsivly locks her mandibles in it, thus increasing the chance of getting eaten by a cow. At evening she comes down and repeats the behavior on the next morning.
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@stayoutofherz Yes, of course, it is most mysterious and spooky, but very interesting.
I specialize in marine biology but I imagine that also in land-environment there must be incredible cases such as that of "zombie" ants