Ducks attacking baby duckling

[Contolini Family]

Hi all.. We recently bought two ducklings, who are about three weeks old. We recently found a wild baby mallard duck that just hatched, and was completely alone, so we brought it home to introduce to the other ducks. However, upon meeting it, one of the ducks immediately began attacking the smaller one, and we're not sure what to do. Any advice?

 

[Chickenlover2017]

Well I do not have ducks but when introducing them you need to supervise so they can peck but not so it gets to bullying Post a pic of your duck here https://www.backyardchickens.com/threads/funny-chickens.1182202/

 

[Contolini Family]

They start biting at it immediately. It is a different breed, is that why? Right now we have it under a heat lamp by itself, but it keeps trying to jump out of the container and hitting itself against the walls