Zoo says baby elephant will stay in Portland, Ore.

Both the Oregon Zoo and Have Trunk Will Travel are association members.

"It is a rather remarkable and unique system that you don't find in other lines of work," Feldman said. "That's just how it works."

Feldman said most koalas in the U.S., for instance, are owned by the San Diego Zoo, which loans them out to other zoos or organizations with several stipulations, including that the koalas get fresh eucalyptus. It's part of their "Species Survival Plan," something drawn up by the Association of Zoos and Aquariums for 303 species.

Standards issued by the association range from the amount of shade and drinking water that should be made available to Asian elephants, to pad and nail trimming.

Five names for the calf were proposed by the zoo. The calf will be named in an online vote. Samudra and the new calf are the nation's first third-generation offspring born into captivity.

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Online:

The Association of Zoos and Aquariums Standards for Elephant Management and Care, http://bit.ly/ViHddP

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Reach reporter Nigel Duara on Facebook at http://on.fb.me/RSmBei