Mother feeding milk to baby video: Spider moms spotted nursing their offspring with milk

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Providing milk and long-term care together is virtually unheard of in insects and other invertebrates. And with the exception of mammals, it’s not even that common among vertebrates. As such, the results “help increase our understanding of the evolutionary origins of complex forms of parental care,” says Nick Royle, a behavioral ecologist at the University of Exeter in the United Kingdom who was not involved with the work. They suggest prolonged mothering may not require the complex brain power that researchers have assumed, he says.

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