http://news.nationalgeographic.com/news/2002/08/0809_020808_wirnzsnake.html
Don't get _too_ shocked. The "mammals" turn out to be a bat on the 2nd page.
More details on this fauna are available here:
http://www.rsnz.org/publish/jrsnz/2003/020-lo.pdf
http://nrm.museum/ve/birds/sape/SAPE_abstracts_2004.pdf