There's more than the usual excitement nowadays here at the National Zoo -- there's a reflection of new concepts in zoo management: fewer bars and fences.

To feed the elephant, you just reach out to an expectant trunk stretched over a moat.

You can clearly see a pair of Dorcas gazelles from northern Africa, locking horns in a brief test of strength.

And Mohini, the rare white Bengal tiger, appears satisfied with her comparatively large, new area. Suddenly her great mouth opens wide - with a satisfied yawn. She's seen tourists like these before.

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