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Brown-red ants climb over a pile of white translucent larvae and orange pupae. Some use their mandibles to position the larvae.
Ant Pupae Feed Adults, Larvae with Secreted Liquid 
The molting fluid of ant pupae functions as “metabolic currency” in the ant colony and may have enabled the evolution of eusociality. 
Ant Pupae Feed Adults, Larvae with Secreted Liquid 
Ant Pupae Feed Adults, Larvae with Secreted Liquid 

The molting fluid of ant pupae functions as “metabolic currency” in the ant colony and may have enabled the evolution of eusociality. 

The molting fluid of ant pupae functions as “metabolic currency” in the ant colony and may have enabled the evolution of eusociality. 

kin selection
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