Kansas City Zoo zookeeper Jacque Blessington says only about 50 of the animals exist in North America. In the wild, they live in the rain forest in northeastern Papua New Guinea.
She says the babies were likely the size of a lima bean at birth.
They are expected to begin poking out their heads or feet as early as May.
---
On the Net:
Lincoln Children's Zoo, http://www.lincolnzoo.org/