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PORTLAND - The Oregon Zoo is preparing for the birth of an Asian Elephant. Rose-Tu is close to delivering her second baby calf.

You can follow all the updates at the zoo's baby elephant blog.

Elephant keepers are checking Rose-Tu s blood for changes in progesterone level, which would indicate labor is ready to begin.

The Oregon Zoo has fifty years of experience in birthing and raising Asian Elephants, and a very high success rate to go along with it.

Zookeepers and watchers are excited for a healthy finish after 20-plus months.

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