From the annals of improbable research we learn more about ducks that we ever wanted to know:
The strange case of the homosexual necrophiliac duck pushed out the boundaries of knowledge in a rather improbable way when it was recorded by Dutch researcher Kees Moeliker.
My brother the avid duck-hunter adds this:
For some odd reason Mallard drakes are notoriously horny. There are numerous examples of trans-species copulation (rishathra?) among the male of Anas platyrhynchos. Homosexuality? Unknown. Since they lack hands, they may be unable to beat off (masturbate). The desire for orgasm may be so great they literally don’t care what they do it with, as long as it is a duck. The female (as usual) doesn’t appear to have the same level of desire as the male. I personally have seen many examples of hybrid pintails and teal in the taxidermist shop. A rare trophy indeed. Other ducks do not appear to have this somewhat distracting level of horniness. The drake mallard call is more of a ‘dweeb dweeb’ than a’ raeb raeb’ but that may be dialect. Cardinals for example have regional dialect.
Now you’re a fuckin’ duck expert, so to speak.