Male mammals typically have rudimentary mammary glands and nipples, with a few exceptions: male mice don't have nipples, and male horses lack nipples and mammary glands. The male Dyak fruit bat has lactating mammary glands.
http://en.wikipedia.org/wiki/Mammary_gland#Other_mammals
And why 13 for opossum?
This is not how I wanted to start my day.
2007-11-17
04:14:33
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The disturbing part is "male mice don't have nipples, and male horses lack nipples..."
2007-11-17
04:19:02 ·
update #1