I think I can solve the mystery without reading the story. To quote Dr. Ian Malcolm in Jurassic Park:
“Life finds a way.”
If there was a male in the adjoining pen they found a way to fulfill their instinctive need to procreate. Whether the male was able to do it naturally through the fence, or passed his semen through on a stick, animals find a way.
I think I can solve the mystery without reading the story. To quote Dr. Ian Malcolm in Jurassic Park:
“Life finds a way.”
If there was a male in the adjoining pen they found a way to fulfill their instinctive need to procreate. Whether the male was able to do it naturally through the fence, or passed his semen through on a stick, animals find a way.
It was through the fence...a 3" glory hole if you will. Poor monkeys.