This is the oldest fossil evidence of spider moms taking care of their young
Her corpse, preserved alongside her offspring in amber for 99 million years, is the oldest physical evidence for maternal care in spiders, says Paul Selden, an invertebrate paleontologist at the University of Kansas in Lawrence. This fossil is one of four showing that some ancient spiders guarded their egg sacs and may even have raised their young, Seldon and his colleagues report September 15 in Proceedings of the Royal Society B.
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