Alerting

[PaxtonPekins]

What do male Pekin ducks do when alerting each other?

 

[KathiQuacks]

If you mean alerting at a predator / possible threat, males will usually stand up tall and make long, loud, single quacks. Sometimes they’ll be quieter if they need to be more discreet. They may freeze and watch or move away from the threat.

 

[ruthhope]

I've had 2 pekin drakes and my son has one. None of them knows what keeping quiet means. Day or night if they hear me (or anyone else, or perhaps a predator) they start loudly yakking away. They give away any hiding place they may have by their compulsion to yak yak yak. I presume they are telling the other ducks that there is danger in the area! Even well after dark if I drive to my son's, as soon as I open the car door I can hear his drake in the coop in the backyard shouting loudly. When I take my pups out late at night for a last pee, there is my pekin drake yakking away in the coop, and my muscovy drakes quickly join in huffing away with him.

Does that help, @PaxtonPekins?

 

[Canadian Wind]

I've never noticed mine doing any sort of alert call either. They just get louder when something bothers them.

When I had a fox attack the flock, they ran, quacking loudly, and found a place to hide. Took me forever to find them they'd never been so silent!!

So, apart from getting louder, they don't have a distinct sound for alerting, unlike chickens which are much less vocally challenged.