FLAMINGOS   The flamingos' pink color is from the beta-carotene in their crustacean and plankton diet.   GREAT WHITE PELICANS  MARABOU STORKS GREAT BLUE HERON                                                                                SUPREB STARLING   OSTRICHES   The ostrich lays the biggest egg in the world. It measures 7" x 5" and weighs 3 pounds. However, the biggest egg for the size of the mother is laid by the kiwi and is a third of the weight of the bird. It is 5" long and can weigh as much as 1 lb. This would be the equivalent of an ostrich laying an 88 lb. (40 kg.) egg.       YELLOW-BILLED STORK                                                                                                  IBIS                   Though it looks like a bird’s knee is bending backwards, what is bending backward is its ankle. Below its ankle is an extended foot bone,                         leading to the toes. A bird’s real knee is usually hidden by feathers.       WHITE HERON                                                                                                          GREY HERON               FLAMINGOS   Flamingos pair for a lifetime. Some stay with their mates for 50 years or more.       TOP               KENYA/TANZANIA/ETHIOPIA 1 2 ADIRONDACK PARK 1 AUSTRALIA/NEW ZEALAND 1 FLORIDA 1 NEW JERSEY BACKYARD 1 2 3 YUCATAN/MEXICO 1    GREY CROWNED CRANE   White-backed Vulture   Some birds like black vultures, turkey vultures, marabou storks poop on their own legs to keep themselves cool and clean. The excrement of these birds is highly acidic, which helps to kill off bacteria they may have stepped in while eating. Additionally, since birds do not have sweat glands to cool off like mammals, vultures defecate on the bare skin of their legs and feet to help with evaporative cooling.   EGYPTIAN GOOS   GREEN HERON   GREATE WHITE ERGET    SECRETARY BIRD   WEAVER BIRD