Lets deal with the "seals" bit first. These rather sleek beasts are in fact Australian Fur Seals - that means that they are a sub-group of seals - but not "classic" seals. And how can you tell I hear you ask! Well, they have external ears and can walk (sort of) on their front flippers. Clearly in these pictures the external ears are the things that you can see. True seals do have them.
Now lets get onto the hat. The wooden structure on which these fur seals are loafing is called "Chinaman's Hat" - it was built to replace and old navigation platform that was named long, long ago.
All these sealy looking animals are boys - or granddads - because this is a bachelor pad for males who do not have a mate. That may because they are too young or too old. I have to say that they do look rather relaxed!
Chairman's hat was a stop on my recent trip around the Bay - there will be bird pictures on Wednesday.
You can find more pictures from around the world (and less taxonomy) at Our World Tuesday.
Enjoy the pictures.