Orangutans get ultrasounds at Fresno's Chaffee Zoo

FRESNO, Calif.

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Sarah and Siaboo the orangutans -- are due about a month apart. Keepers have trained the "moms to be" to participate in the regular ultrasounds -- by coaxing them with treats.

The goodies get them to stand still at the front of the cage during the procedure. And instead of regular gel -- Siaboo prefers a blend of avocadoes on her belly.

Zoo experts got a fairly good look at the newborns on the monitor, although the primates were a little skittish.

Doctors will attend the births this fall -- but won't intervene unless the mothers need help.

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