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) performed in the medium-large breeds of dogs. An animal suffering from hip dysplasia may have been in some degree of chronic pain all its life from a very young age but mat show no overt sign of pain. Rather, they have adapted to the pain over an extended period, and learned to live with it. As a result in many animals, successful hip replacement is gives animals a level of playfulness and happiness not previously seen. As with all surgeries, results vary, and there is both risk and uncertainty involved. Animal hip replacements are usually made from the same material