One more type of critter to look for on whale watches are birds, especially the pelagic birds. [Pelagic, or open-ocean birds, are distinct from the coastal birds that "commute" each morning offshore, only to return to land each night (such as gulls) -- pelagic birds remain over the water entirely for months at a time, only returning to land fro breeding during one short part of the year.] Some examples of New England waters pelagic birds follow:
Many birds (both coastal and pelagic) can often found in the vicinity of whales, since they often feed on the same food animals as do the whales (such as this humpback named "Pixar") --
One fairly common pelagic bird is the greater shearwater (which is just a little smaller than a herring gull) --
Shearwaters get their name because their wing tips can often be seen "shearing" the surface of the water.
Personally, I find greater shearwaters to be the most interesting and most beautiful bird in the world (YMMV, of course) --
Shearwaters, when in flight, typically alternate a few quick flaps followed by a long glide --
Here, a greater shearwater can be seen overtaking and about to pass a slower Cory's shearwater --
Cory's shearwaters are almost as large as a herring gull (although a bit less stocky) -- in New England waters, the appearance of Cory's shearwaters can vary a lot from year to year --
Most pelagic birds do not fly constantly, but do "sit down" on the water at times -- here is a raft of mostly greater shearwaters and one sooty shearwater (the dark bird to the right side in the photo) --
Sooty shearwaters are about the same size as greater shearwaters, but are a little less common in New England waters --
The largest pelagic birds in New England waters are northern gannets -- here is flock of one adult and several juveniles --
The smallest pelagic bird in many places - but perhaps the most numerous bird in the entire world - is the (maybe robin-sized) Wilson's storm petrel --
Wilson's storm petrels can often be seen in flocks "fluttering to and fro" just above the surface of the water --
At times they can even be seen to be trying to touch down ...
... to seemingly try to "walk on the water" --
A far less common pelagic bird in New England waters is the northern fulmar --
While the particular species of pelagic birds that can be seen vary by location and season, I believe it is certainly worth looking for pelagic birds (that many whale watch passengers may have never seen before) on any whale watch...