Are these eggs fertilized?

[3kennedys]

I got rid of my roosters about a month ago but have a black sumatra, who is 5 months, that Im not totally sure if its a male or female. This double yoker from my leghorn looks like maybe they were fertilized but Im not sure. What do you think?

 

[SA Farm]

Yup, they're fertile!

 

[jeffchrissie]

How can you tell?

 

[SA Farm]

The little white spot on the yolk.