Cougar Mountain Zoo 2009, Peter Rittler continued in the zoo's management. The zoo collection features 32 exhibits of animal habitats concentrating on endangered species such as tigers, lemurs, wolves, reindeer, cranes, wallabies, macaws, and cougars, among others. On June 16, 2007, the zoo acquired two male Bengal tiger cubs, a royal white and a golden, who were born eight weeks apart in a Florida tiger preserve. The zoo added an additional two cubs in 2009. A glass-walled tunnel called the "Tiger Tunnel" enables visitors to view tigers in close proximity. In 2011, a 370-pound (168 km) tiger was photographed holding his paw up
Hip replacement (animal) at an early age, while muscle is more likely to re-develop, rather than in old age when convalescence is longer and more difficult. However this is a major surgery taking several months to fully recuperate, involving the large muscle groups of the hips, and is irreversible. Whilst it has a high success rate (circa 95%) in the hands of a good surgical team, even in older dogs, it is therefore often recommended to avoid it until quality of life is seriously affected beyond the capability of medication to control. Thus the benefits of hip replacement at a younger age must