Identifying duck breed / sex

[Spooks]

I am a first time owner and bought ducks a week ago with some chicks.
I need help help identifying breed and sex of my ducks though they look like pekins. The owner of the pet shop did say that the adults are a couple and have laid eggs previously. But need to be sure.
Also the chicks and the adults were bought separately, its been a week, at first adults used to bite the chicks but the biting is reducing by each day. Will they finally get along?

 

[DeCanard]

You can tell gender in a few ways. First is by their voice. Female ducks have the distinct quack that ducks are known for, males have a softer, rougher voice. Also, drakes have a curled feather on the tail when they are adults, female ducks do not. Hope that helps!

 

[Spooks]

Any idea about the breed?

 

[Kevin565]

It looks like possibly a hatchery Fawn and white runner or runner mix and maybe a maybe pekin

 

[DeCanard]

I'm not sure about having the ducklings and adults together. If the biting continues; you may want to separate them until the little ones are bigger.

 

[Kevin565]

I agree I would never leave ducklings alone with adult ducks. Ducks can be aggressive at times and could seriously harm or kill the babies