Heitman says he is thankful for the medical supervision he received while on the diet.

CNN: Extreme diets: Life on 800 calories a day

"A polar bear was on his way home from the Alps after doing some shooting for some advertising and was really gentle actually, " Heitman said.

CNN: All creatures great and small at Frankfurt's Animal Lounge

There is no such thing as an average day, Heitman says.

CNN: All creatures great and small at Frankfurt's Animal Lounge

Run by German carrier Lufthansa, animals range from domestic pets to more exotic specimens destined for zoos and animal reserves, explains Axel Heitman, director of the Animal Lounge.

CNN: All creatures great and small at Frankfurt's Animal Lounge

"This could easily degenerate into chaos, " concedes Paul Heitman, a senior program architect at Comverge, which hopes to extend its metering expertise for air-conditioning systems to plug-in cars.

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