In article ,
says...
Thank you to both Roberts. I'll take a closer look tomorrow if I can. Just
now the ones we do see are in the water, doing what comes naturally so it's
just the occasional glimpse that allows me to see them. I think the biggest
I saw today was probably 8" long when he stretched right out. He really was
a huge and senior member of the colony! I don't think taking my eye down to
a memory of 6" does him real justice.

He was probably a she - the females are noticeably larger.
--
Kay