Since the drakes are coming into the trap because they are attracted to the females, I guess they are still excited when we catch them and sometimes when we turn them over to swab them for avian influenza we find this!
Ducks and Geese and thier close relativet are the only birds that have an extendable sexual organ. Not all of thier copulation is what you would call consentual. We often see a group of male ducks forcing copulation on an unpaired hen. The sex ration in ducks is extremely skwed towards males. This pseudopenis and aggressive sexual behavior is one of the resonas there are so many duck hybrids seen in the wild.
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