Indies, showing the distinctive blow. Note that the spout projects
obliquely forward from the blowhole, which is displaced to the left
front of the head. (_Photo by H. E. Winn._)]

[Illustration: Figure 55.--Note the distinctive body shape and the
position of the blowhole of these swimming sperm whales, and, in the
animal on the left, the broad tail flukes. (_Photos from the North
Atlantic by S. Green (left) and from the North Pacific by S. Ohsumi
(right)._)]

[Illustration: Figure 56.--A sperm whale mother and calf off Baja
California, showing the distinct dorsal hump and the extremely long
head. In the bottom photo, from the West Indies, note the dorsal hump
and the crenulations of bumps which follow it. Both the hump and the
crenulations may be visible as the animal arches its tail to begin a
deep dive. Note also the wrinkled appearance of the body. (_Photo by K.
C. Balcomb (top) and H. E. Winn (bottom)._)]

[Illustration: Figure 57.--Sperm whales often show their broad tail
flukes as they begin long dives, which may last over an hour and take
them to depths of several thousand feet or more. Note the smooth rear
margin and the nearly triangular shape of the flukes. (_Photo from off
Baja California by K. C. Balcomb._)]

[Illustration: Figure 58.--A stranded infant male sperm whale at
Melbourne Beach, Fla. (top) and a male adult sperm whale on the deck of
a whaling ship in the Pacific (bottom). Note the bulging forehead, the
narrow, underslung lower jaw, the white coloration around the mouth,
particularly at the corners, and the wrinkled appearance of the body. In
the bottom photo note also the whitish region on the belly. (_Photos by
P. Winfield (top) and Japanese Whales Research Institute, courtesy of H.
Omura (bottom)._)]

[Illustration: Figure 59.--The narrow lower jaw of a sperm whale
contains from 18 to 25 large functional teeth, which fit neatly into
sockets in the upper jaw. Occasionally, the upper jaw also contains some
teeth. (_Photo from the North Pacific by Japanese Whales Research
Institute, courtesy of H. Omura._)]

[Illustration: Figure 60.--The throat and lower jaw of a sperm whale on
the deck of an eastern Canadian whaling station, showing the numerous
short throat grooves, which are most clearly evident on adult animals.
(_Photo by J. G. Mead._)]

[Illustration: Figure 61.--Detail of the broad, paddle-shaped flipper of
a sperm whale from the North Pacific. (_Photo from Japanese Whales
Researc