Wow. This is a bit depressing. Scratch that, a lot. According to the Chron, former directors of zoos around the globe gave the San Francisco Zoo a failing grade when it comes to caring for animals. Some of the zoo's problems are "severely outdated exhibits and animals that behave unnaturally." Take, for example, glaring issues as the African Savanna exhibit -- which lacks enough shelter or food for animals, according to Peter Stroud, a......