In a recent Cambridge University study, humans came out moderately monogamous, placing 7th out of 35 mammals with 66% of siblings being full siblings. The California deermouse topped the list with nearly 100% fidelity, while chimpanzees (4.1%) and Soay sheep (0.6%) ranked lowest. Also more faithful than us were the African wild dog, the Damaraland mole rat, the moustached tamarin, the Ethiopian wolf, and the Eurasian beaver. You wouldn't think a mole rat would have all that many opportunities to run wild, but there ya have it.
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