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http://www.cnn.com/2004/TECH/science/05/25/israel.chimpanzee.reut/index.html

Chimps give Jerusalem zoo twin surprise

Tuesday, May 25, 2004 Posted: 10:17 AM EDT (1417 GMT)

JERUSALEM, Israel (Reuters) -- Israeli zookeepers suspected some monkey 
business only after Maya, a 24-year-old chimpanzee, suddenly gave birth to 
twins despite an apparent lack of virile mates.

The happy event at Jerusalem's Biblical Zoo caught everyone by surprise: 
nobody had noticed Maya was pregnant and Og and Gremlin, the only adult 
males among 11 chimps at the facility, were sterilized years ago, a zoo 
official said on Tuesday.

A search for the father found that a precocious seven-year-old chimp called 
Nicky had reached puberty early and was probably having the run of the 
primates' house.

"We have another eight fat female chimps who, as in Maya's case, we thought 
had gained weight by eating too much during the winter," said zoo official 
Sigalit Dvir.

"But it looks like we'll be seeing some more babies soon."