Hey, very possible. Haven't found any in the right colors yet, but seems to be a similar shape when the neck is scrunched down.
http://www.saltgrassflats.com/birds/american_bittern.html - don't be put off by the name - they're found around fresh as well as brackish water
about the same size as the least blue - but more grey-y and stripey
they're very cool birds - scrunchy, stretched out or doing their reed imitation
Very cool birds. Very big when you do spot one around here...and in such contrast to the usual little fellas you do think you're seeing things.
