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a howler monkey. Howler monkeys are so named because of the very loud
sounds they make, which can be heard up to two miles away. They are
considered the loudest land-living animals. They have two hollow hyoid
bones that allow them to make the powerful sounds they are known
Male howler monkeys are black, and females range from a brown to
a light tan color. They have a large neck and a large lower jaw
(containing the large hyoid bones), short legs, and a long, prehensile
tail. All baby howler monkeys are born with brown fur, but the fur on
the males eventually changes to black. These monkeys can grow up to 2
feet in length, and can weight up to 16 pounds. The males are usually
significantly larger than the females.
Howlers travel and live in packs of one to three males and two
to seven females. There is one dominant male in each group. They spend
the majority of their time in trees. Their howling vocalizations are
used to mark their territories as well as to communicate with other
packs of monkeys. Their diet consists mostly of leaves, but they also
eat fruit and bugs. They are becoming an endangered species due to the
shrinking size of the forests in which they live and find food.
Mary Brady was the production editor and the copyeditor for the
Sarah Sherman provided quality control. John Bickelhaupt wrote the
Ellie Volckhausen designed the cover of this book, based on a
series design by Edie Freedman. The cover image is a 19th-century
engraving from Cuvier's Animals. Emma Colby produced the cover layout
with QuarkXPress 4.1 using Adobe's ITC Garamond font.
David Futato designed the interior layout. This book was
converted by Joe Wizda to FrameMaker 5.5.6 with a format conversion
tool created by Erik Ray, Jason McIntosh, Neil Walls, and Mike Sierra
that uses Perl and XML technologies. The text font is Linotype Birka;
the heading font is Adobe Myriad Condensed; and the code font is
LucasFont's TheSans Mono Condensed. The illustrations that appear in
the book were produced by Robert Romano and Jessamyn Read using
Macromedia FreeHand 9 and Adobe Photoshop 6. This colophon was written
by Mary Brady.
The online edition of this book was created by the Safari
production group (John Chodacki, Becki Maisch, and Madeleine Newell)
using a set of Frame-to-XML conversion and cleanup tools written and
maintained by Erik Ray, Benn Salter, John Chodacki, and Jeff