coturnix quale sexing and observation

[samsr]

I hatched out 9 coturnix quail this time last week. They are all alive and kicking.
I am noticing that 4 of them are quite a bit larger in size than the other 5. Could the larger ones be males? Is there a way of sexing them at this age besides vent sexing. This is my first time raising quail and this is just one of my observations. Another is that I have one that is quite loud at night. It sounds kinda like it is calling to others. Almost like a cricket. Is this normal. What is little guy trying to say?

 

[lewee]

check the breast feathers, look for a rust color starting on them, the 1's wthout that are usually females, rusty ended breast feathers are a male, and yes, they do "the cricket "thing, although im not sure which is doin that

 

[quailresearcher]

Mine are 23 days old now and mine are just now getting their red chests. Plus it depends on breed of coturnix not all have a red chest. I know the brown and pharoh have a red chest. I have 7 Pharaoh and 3 turned out to be Roosevelt. I though was one but today two of my others appear to have red forming on their chest.