Monogamy may sound sweet, but why it evolved isn't

Monday, July 29, 2013 | 5:41 p.m. CDT; updated 7:49 p.m. CDT, Monday, July 29, 2013

WASHINGTON — Only a few species of mammals are monogamous, and now dueling scientific teams think they've figured out why they got that way. But their answers aren't exactly romantic.