Hi Paul and all,
 
First a question: according to my dictionary nekton is a form of big plankton.
Solariella is a Trochid genus. Does this species (Solariella nektonica) it's
whole life in the nekton or only the larval stages?
 
Concerning swimming birds. They are not exactly fish, but if the distance to
the shore is not too great they generally are able to flap themselves forward
with their wings. How succesful they are depends on the fatty layer on the
feathers.
Especially sparrows like to take a bath, but definitely don't like to swim.
 
Sincerely, Erick
(from Holland, not in Michigan)