How to distinguish the pigeon and mother accurate

If you want to accurately distinguish the pigeons, you can gently pull the pigeon's mouth with your hands, and suddenly let go. It is the male pigeon that earns and shakes his head backwards.You can also touch its pubic bone. The pigeons are parallel to the pubic bone when touching, and the public pigeons are concave in the inside.Or observe its toes and tails, the left toe on the pigeons is long, the tail feather is upset, and the dirt is the male pigeon.