Sofia Zoo marmoset, and macaques. The predator sector houses big cats, bears and small predators, including lions, tigers, leopards, pumas and brown bears. In January 2011 the zoo received eight Humboldt penguins on loan from Germany. The penguins are on loan for about 18 months, after which they will be returned, with any offspring to stay at the zoo. The zoo has some 1,400 individual birds representing 192 species. Waterbirds are housed in a lake, and Imperial eagles, Griffon vultures, Egyptian vultures and buzzards in a large walk-through aviary. Other species of birds at the zoo include ostriches, Silver pheasants, peacocks, flamingos,
Hip replacement metal on crosslinked polyethylene (MOXP), ceramic on ceramic (COC), ceramic on crosslinked polyethylene (COXP) and metal on metal (MOM). Each combination has different advantages and disadvantages. Post-operative projectional radiography is routinely performed to ensure proper configuration of hip prostheses. The direction of the acetabular cup influences the range of motion of the leg, and also affects the risk of dislocation. For this purpose, the "acetabular inclination" and the "acetabular anteversion" are measurements of cup angulation in the coronal plane and the sagittal plane, respectively. Risks and complications in hip replacement are similar to those associated with all joint replacements. They