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Slave-making ants sometimes mark victims for violence during a takeover, yet "this is the first study of which I am aware that shows this is going on inside a single colony.
Joan Herbers of Colorado State University in Fort Collins, who studies slave-making ants, calls the wasp report "most interesting.
The slave-making ants from New York did more damage than their West Virginia counterparts, capturing a greater percentage of each invaded brood and killing more queens.
A specialist in slave-making ants, Joan Herbers of Colorado State University in Fort Collins concurs that the biological costs of slavery remain open for discussion.
A colony of 3,000 slave-making ants may have more than 6,000 slaves.