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The animal on the cover of Securing Ajax Applications is a spotted hyena (Crocuta crocuta). This is also sometimes known as the laughing hyena, due to its distinctive rallying call, which is said to sound similar to a human's laughter. This animal is native to Africa. It lives in a group, or "clan," of about 30–40 hyenas. The hyena is unique to carnivores in that the female is dominant over the male.

In addition to having spots, this hyena's fur is varying shades of light brown. Its snout is dark, as is the tip of its tail. I's body slopes downward from the head, and its front legs are longer than the back legs. It has a large, extremely powerful jaw, which it uses as its foremost weapon when hunting prey.

The hyena has a reputation as a scavenger, but this is actually incorrect. Although it does steal food from other animals, it is also a skilled hunter, able to target and kill even large animals such as zebras. There is no love lost between lions and hyenas, as they seem to have an inborn hatred of each other. Lions have been known to kill hyenas for sport, while hyenas prey on smaller lion adults and cubs.

The cover image is from Wood's Illustrated Natural History. The cover font is Adobe ITC Garamond. The text font is Linotype Birka; the heading font is Adobe Myriad Condensed; and the code font is LucasFont's TheSans Mono Condensed.

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