KABUL, Afghanistan -- In 2001, as the Taliban government collapsed, the Kabul Zoo had been almost destroyed by years of war and neglect. Exhibits were bombed out, and many of the animals had been maimed, been eaten by hungry Afghans or died of hunger.

That's when the North Carolina Zoo stepped in with more than $400,000 it had collected in donations. Other foreign groups pitched in, and the donations eventually reached nearly $2 million.

The result: Despite being no larger than a suburban U.S. high school campus, the zoo has become one of the most popular leisure attractions in Afghanistan -- so popular, in fact, that ticket sales generate more money than it costs to operate the attraction.

Now Kabul's mayor wants to make the zoo more than five times larger -- with more animals, more space and more crowd-pleasing species from places such as Africa.

Those who helped revive the zoo say that might be a big mistake.

"Getting them to understand what they can do that will be sustainable, given their resources and the climate there, is difficult," said David Jones, the director of the state-owned North Carolina Zoo in Asheboro, which covers 150 times more land than its counterpart in Kabul.

Jones, who's long been involved in helping zoos in the developing world, said the idea of a sprawling zoo with more species from more places raised a host of issues, including simply the cost of heating and cooling animals' housing in Afghanistan's climate, which is known for its big swings in daily and seasonal temperatures.

Jon Coe, one of the world's best-known zoo designers, was hired in 2011 as part of a $120 million aid package to improve the city from the U.S. Agency for International Development. His design for the zoo emphasized native species, education, conservation, the health of the animals and sustainability over flash. The area for animals would grow only moderately. The emphasis would be on species native to Afghanistan. Land across the Kabul River that's been earmarked for expansion would become a conservation-minded river park tied in with the zoo.

The idea was a zoo that Kabul could afford to run properly even if the foreign funding that now fuels the city's budget dries up, Coe said in an email from his home in Australia.

His design, though, has failed to satisfy the mayor, Mohammed Younas Nawandish, a short, mustachioed, wildly popular buzz saw of a man dubbed "The Builder of Kabul."

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