31
Back Bay Basin,
Boston, Mass.
1909
Feb. 27
(No 31)
head and then vanishing with surprising if not
mysterious quickness. Occasionally, however, it would
spring upwards and forward with lowered head and
strongly arched back, in the manner of a Grebe or 
Merganser, sometimes showing not only the entire outline
of the lower parts of the body above the surface but also the whole of
the legs and feet, just before reentering the water.
This may be done to give greater impetus to the descent
but I observed that the same bird would sometimes
alternate one method with the other during successive
dives made over exactly the same spot.
Whistlers diving
They spring clear of the water