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The animal on the cover of Electronics Cookbook is an elephantnose fish (Gnathonemus petersii). This species is native to West and Central Africa, where it favors muddy and heavily-vegetated areas of rivers. Its Latin name petersii most likely refers to German naturalist Wilhelm Peters.

The elephantnose fish is oblong-shaped and typically dark brown or black in color. Its “trunk”—the signature feature from which the species’s common name is derived—is not actually a nose, but an extension of the mouth that is covered in electroreceptors. Gnathonemus petersii produces a weak electric field that is used to probe for food, navigate through murky waters, and detect prey. It also lends itself to communicating with other fish and finding mates.

Many of the animals on O’Reilly covers are endangered; all of them are important to the world. To learn more about how you can help, go to animals.oreilly.com.

The cover image is from Lydekker’s Royal Natural History. The cover fonts are URW Typewriter and Guardian Sans. The text font is Adobe Minion Pro; the heading font is Adobe Myriad Condensed; and the code font is Dalton Maag’s Ubuntu Mono.