Since entering Amur's den, Timur has gained 45 pounds, which has become a health concern to the caretakers at the zoo. "Timur's problem is obesity," Mezentsev continued.
The other concern - that Amur's affection for Timur may suddenly change - has to do with timing. The female tigers have entered their mating period, and this could cause Amur to become more aggressive. The zoo fears that this change in behavior could cost Timur his life ... something the zoo wasn't very concerned about in November. After all, they did offer him to Amur as food.
But times have changed since then. The duo is now an internationally recognized commodity for the zoo, which has gone so far as to apply to trademark the Russian and English names of each animal.