What gender are my ducks?

[Chillen with the quacks]

So ive been looking at my round and I we have ordered a male and female duck from Metzer farms and we checked and their heads are turning green. I'm,confused so I need help

 

[sourland]

Can you post pictures. If their heads are turning green, they are most likely drakes.

 

[Chillen with the quacks]

Here they are

 

[junebuggena]

How old are they?

 

[keesmom]

Do their voices sound the same? Does either of them quack loudly?

 

[Chillen with the quacks]

They both sound the same and they sound medium but they quack loudly when I am away

 

[Chillen with the quacks]

Also they are five weeks old

 

[sourland]

Right now they are not 'drake green'. As they mature eye stripes of the drake will disappear, and the entire head will become green when in nuptial plumage.

 

[Chillen with the quacks]

Ok...Thanks
Tommorow I'm going to need to figure out the gender of our new batch of black star pullets with a cuckoo maran