Instead, it consists of a substance called crop milk because it's stored in the parent's crop, and flamingos are one of only three birds that can produce this stuff. But even among our feathered ...

Instead, it consists of a substance called crop milk because it's stored in the parent's crop, and flamingos are one of only three birds that can produce this stuff. But even among our feathered ...

Both male and female pigeons (they are birds renowned for sharing the parental workload) produce a liquid called crop milk, which is found in the crop, a sac at the base of their necks.