http://www.newsweek.com/baby-spiders-suckle-milk-fluid-their-mothers-genitals-1236674

A species of spider has been found to suckle a milk-like substance from its mother. This is thought to be the first time such a behavior has been reported among spiders, and could suggest milk production is not largely confined to mammals.

Zhanqi Chen, from the Chinese Academy of Sciences, and colleagues were investigating a species of spider—Toxeus magnus—that mimics ants. The species is known to have an unusual breeding nest, where there are two or more adults, or one adult female with several offspring. Because the species do not live in colonies, this suggests the mother spider provides maternal care until her offspring enter adulthood.