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The animal on the cover of JSON at Work is the Siberian jay (Perisoreus infaustus), a small bird native to northern Eurasia. Its habitat range is extremely large, stretching from Sweden in the west to China in the east. They make their nests in coniferous trees found in dense boreal forests (also known as taiga).

Siberian jays can grow to be 29 centimeters long and can weigh up to 79 grams. They have long tails and brown and gray coloring. Siberian jays are omnivorous, feeding on berries and seeds as well as insects, carrion, and small rodents. Females lay their eggs once a year in March or April, and raise their young before the winter arrives.

There is some evidence that the European population of Siberian jays is declining as a result of human-caused deforestation. However, because of their massive range across sparsely inhabitated regions of Asia, the Siberian jay not currently listed as endangered or threatened.

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 Riverside 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.