Duck body language--question

[gilbert2]

Dear People,
Can anyone tell me what you think the following duck behavior is? My ducks sometimes move their heads up and down, with their beaks held perfectly level. It is a bobbing motion without any beak tilting at all! I have tried to make a note of what else is happening at the time, but as yet, have not succeeded.
If anyone can postulate what this interesting movement means, I would sure like to hear it!
Thanks.

 

[buff goose guy]

its kind of a warning/alerting to let the others know that something is there. Mallards usually do this before flying away.

 

[Amykins]

its kind of a warning/alerting to let the others know that something is there. Mallards usually do this before flying away.

Huh? It sounds like mating behavior to me...

 

[buff goose guy]

ok well are there necks elongated when they do this or are the doing it towards each other ?
apparently ive just seen something different or didnt read that right my bad, sorry.

 

[brookesducks]

It's defiantly a mating behavior. My ducks always do this before they mate.