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,
Concentrated animal feeding operation Concentrated animal feeding operation A concentrated animal feeding operation (CAFO), as defined by the United States Department of Agriculture (USDA) is an animal feeding operation (AFO)—a farm in which animals are raised in confinement—that has over 1000 "animal units" confined for over 45 days a year. An animal unit is an animal equivalent of 1000 pounds live weight. A thousand animal units equates to 1000 head of beef cattle, 700 dairy cows, 2500 swine weighing more than 55 lbs, 125 thousand broiler chickens, or 82 thousand laying hens or pullets. A CAFO is also an animal feeding operation of any