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The animal on the cover of Adding Ajax is a forked mouse lemur, usually called a fork-marked lemur (Phaner furcifer). Like almost all lemurs, the fork-marked lemur is only found on the island of Madagascar. It is native to the rainforests in the northern and western parts of the country. The fork-marked lemur measures about 18 to 22 inches long, but its tail makes up half of that length. This lemur's name comes from the black markings that run from each eye over the top of its head in the shape of a two-pronged fork. This particular primate depends on gum from the temperate deciduous trees for its sustenance, but will sometimes eat the honeydew from insect larvae as well as insects for protein. The fork-marked lemur is the most vocal of the lemurs, with more than seven documented calls—including ki, kiu, kea (only made by males), hon—as well as alarm, distress, and fighting calls.

Like most animals around the world, the fork-marked lemur's habitat is being threatened by increased land development and farming. Its extinction status is currently near-threatened. However, efforts are being made to preserve this lemur; it can be found at a number of parks and reserves around the country.

The cover image is from Lydekker's Library of 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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