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Above, Bot Fly Larvae! by Marcel Rawady :::

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Above, Glossodoris coi by David Henshaw :::

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Above, Chromodoris willani by eunice khoo :::

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Above, parasitoid larva! by Bonnie Ott :::

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Above, Lice on eyelashes! From here :::

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Above, Phyllodesmium serratum by Matt Tworkowski :::

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Above, Leucochloridium paradoxum! by Stevie Smith

An intriguing parasite which invades the eyestalks of some snail species. It then alters the snails behaviour to seek out light, where the infected eyes appear as moving worms which attract, then are eaten by birds, where they mature and lay eggs in the birds rectum, being then passed out to begin the lifecycle again through the snail host. :::

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Above, Kunes Chromodoris by Matt Tworkowski :::

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Above, Digidentis arbuta by Matt Tworkowski :::

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Above, Fly pooping! by Henry Lallianzuala :::

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Above, Nembrotha lineolata by David Henshaw :::

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Above, Janolus sp. by digidiverdeb :::

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Above, Tick! by scubaluna :::

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Above, Chromodoris alcalai by Brian Mayes :::

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Above, Fly Anus! by greffeb :::

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Above, Poison fangs of a centipede! by Walter A. Piorkowski :::

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Above, Chromodoris kuniei by Marco Waagmeester :::

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Above, Chromodoris quadricolor by Rafi Amar :::

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Above, Taenia solium (tapeworm)! by Teresa Zgoda :::

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Above, Pteraeolidia ianthina by Brian Mayes :::

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Above, Naegleria fowleri aka The Brain Eating Ameoba! source :::

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Main image by unknown (found searching for 'Halloween question mark image' and has a dead link)