This article from the mental floss blog. It's a tale of six fascinating ant species.

First we have a Madagascar specimen called the Dracula ant (Adetomyrma sp.). But I don't think Dracula did anything quite like these ants. You see, they feed on the blood of their own larvae. Here's how it goes: the larvae are larger than the adults. The adults bring corpses of fallen insects back to the colony, which they feed to the larvae. The larvae in turn digest the offerings and secrete the protein in liquid form, which the adults live off of.

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