Black spot on quail quick's beak

[AQuailGuy]

I have a few 1 weel and a half old quail chicks. Two are tibetan, two silver and the rest are some sort of brown kind. Three of the 'some sort of brown kind' are developing these dark patches at the base of their beaks. I only noticed it two days ago. They seem to be healthy.

Is this some sort of disease, or perfectly normal?

The pictures is one of the chicks at a day old vs this morning.

 

[Nabiki]

Normal. It's just pigment.

 

[AQuailGuy]

Normal. It's just pigment.

Thanks, i was really worried lol

 

[CountrifiedCoturnix]

I have some italians and manchurians - I don’t know the difference between them - but one has black on the beak and others don’t? I agree with pigmentations, might be something with colors/genes.