to account for such vagaries on other grounds than that a sick animal
will go any distance to get away from its companions"[67] (and perhaps it
should be added from its enemies).

Often the under sides of the floes were coloured a peculiar yellow. This
coloration is caused by minute unicellular plants called diatoms. The
floating life of the Antarctic is most dense. "Diatoms were so abundant
in parts of the Ross Sea, that a large plankton net (18 meshes to an
inch) became choked in a few minutes with them and other members of the
Phytoplankton. It is extremely probable that in such localities whales
feed upon the plants as well as the animals of the plankton."[68] I do
not know to what extent these open waters are frequented by whales during
the winter, but in the summer months they are full of them, right down to
the fringe of the continent. Most common of all is the kind of sea-wolf
known as the Killer Whale, who measures 30 feet long. He hunts in packs
up to at least a hundred strong, and as we now know, he does not confine
his attacks to seal and other whales, but will also hunt man, though
perhaps he mistakes him for a seal. This whale is a toothed beast and a
flesh-eater, and is more properly a dolphin. But it seems that there are
at least five or six other kinds of whales, some of which do not
penetrate south of the pack, while others cruise in large numbers right
up to the edge of the fast ice. They feed upon the minute surface life of
these seas, and large numbers of them were seen not only by the Terra
Nova on her various cruises, but also by the shore parties in the waters
of McMurdo Sound. In both Wilson and Lillie we had skilled whale
observers, and their work has gone far to elucidate the still obscure
questions of whale distribution in the South.

The pack-ice offers excellent opportunities for the identification of
whales, because their movements are more restricted than in the open