Ha ha.  Yes, perhaps a missed opportunity.

We used to refer to them as "water rats".   It's because we occasionally saw South Vietnamese army  soldiers alongside rice paddy irrigation canals, waiting for them to get flushed out so they could shoot them.  Needless to say, if our guys weren't anticipating the shots, they'd drop to the ground at the sounds, flicking safeties off their rifles at the same time, and pointing accordingly.  Somebody had to yell "hold fire!", just in case.

Google rat dishes, Mekong Delta, and you'll get a better description of those "delicacies".  Maybe they do taste like chicken.