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The animal on the cover of Functional Programming with C# is the eastern coyote (Canis latrans var.), also known as the coywolf.

One of 19 subspecies of coyote inhabiting the Americas, the eastern coyote is actually a hybrid of eastern wolf (C. lycaon), coyote (Canis latrans), and domestic dog, and is thus larger than the typical western coyote, weighing an average of 45–55 lb. It also holds a more extensive territorial home range and is present throughout the eastern United States and Canada, from Newfoundland and Labrador to Georgia.

Eastern coyotes are opportunistic omnivores and will feed on whatever is available and easy to kill or scavenge, from grasshoppers to moose. They typically live and hunt in small family units (consisting of an adult breeding pair and pups), though anyone privileged enough to have overheard a group howl at night might think them pack hunters like their wolf relatives: coyotes can raise quite a cacophony when they want to!

With a rising global population trend, coyotes are not currently considered threatened from a conversation point of view. Many of the animals on O’Reilly covers are endangered; all of them are important to the world.

The cover illustration is by Karen Montgomery, based on an antique line engraving from Lydekker’s Royal Natural History. The cover fonts are Gilroy Semibold 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.

And now you don’t. You’re still here? It’s over. Isn’t your family missing you? Go, spend some time with them! Go on, shoo!