A group of investors has unveiled plans to erect a 175-meter high wheel for 120 million euros ($158.9 million) in the German capital, hoping to attract millions of visitors from 2008.
But animal rights activists oppose the project, saying the fully-illuminated wheel would disturb the rhinos' daily routine.
"We're worried that these endangered animals won't breed any more, which would hamper animal protection programs," Berlin's animal rights association said in a statement.
The planned Berlin wheel would be higher than the London Eye, which claims to be the world's tallest observation wheel at 135 meters, according to its Web site.
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