Mask of carmine skin on head, red eyes, white nape extending down to silver mantle with throat and belly of slate gray, red legs, straight toes, and upper beak crosses over lower beak a bit. As part of a crane conservation program, the Potawatomi Zoo has sent the eggs from our cranes to Russia where they are hatched and the chicks are then puppet raised and released into the wild. Seven of the 15 species of cranes are listed as threatened or endangered. The white-naped crane is listed as endangered. The destruction of natural habitat on breeding grounds, in wintering areas and along migration routes is having a devastating effect on crane and other migratory bird populations. A 1996 IUCN report estimated that only 4,900-5,300 white-naped cranes remain in China, Japan, and South Korea.