I’m going to make a potentially provocative statement here: No bird family embodies diversity better than finches. Hear me out. The familiar House Finch flitting around your feeder is more closely related to the fantastic and almost mythical Palila, ‘Akiapola‘au, and Kiwikiu (formerly Maui Parrotbill) than it is to the Dark-eyed Junco hopping on the ground below. Finches are amazingly variable not only in their behaviors, but also in their morphologies: from the deep rose of a hulking Pine Grosbeak to the classic brilliant yellow of a slender American Goldfinch. And also in their habitats: The Brown-capped Rosy-Finch nests on rocky talus slopes bordering snowfields in the high Rocky Mountains, the Redpoll (now a single species) inhabits willow stands in the Arctic, and the Lawrence’s Goldfinch darts through sun-kissed dry oak woodlands in southern California.

This immense diversity of appearance, behavior, and distribution makes it fitting that such wonderful birds should be paired with an equally delightful field guide. The Stokes Guide to Finches of the United States and Canada, by Lillian Stokes and Matthew A. Young, is the latest installment in the acclaimed series of Stokes guides—but with a twist. Instead of a geographically focused guide (such as The New Stokes Field Guide to Birds: Eastern Region), this is a single-family volume describing all regular and vagrant finches of the U.S., including the Hawaiian honeycreepers. With the addition of Matt Young, the founder of the Finch Research Network, as coauthor, this guide reaches a level of detail that is almost unparalleled.

The guide is sorted into four main sections: (1) species accounts for mainland resident, mainland vagrant, and Hawaiian finches; (2) a how-to guide on attracting and feeding finches; (3) an overview of the phenomenon of irruption as it applies to finches; and (4) a summary of relevant finch research including a much-appreciated section on ways to get involved. Got all that? Most field guides would be hard-pressed to cram half that information into a reasonably sized book, much less to create a guide that conveys a mindboggling amount of detail while transmitting the authors’ infectious love for finches.

A significant advantage of this broad approach to the book’s content is its flexibility. In a species where identification concerns are minimal, like the Pine Grosbeak, the species accounts can focus on authorial anecdotes, information on the meaning of vocalizations, and techniques for finding the birds during irruptions. But the focus shifts more toward field identification in certain birds where it is more confusing. Consider the case of the Redpoll, treated by the AOS as two species (Common and Hoary redpolls) until the second half of 2024—after Finches had been written. That said, distinguishing between the two is still of interest to many birders, and the guide delivers wonderfully. Both taxa are granted full-length species accounts focusing on ecology and life history, with a subsequent section solely devoted to telling the two apart. The authors make clear distinctions between primary field marks, like the amount of streaking on the undertail coverts, as well as more subtle and variable secondary field marks, like the extent of the pink wash to the underparts.

Where this guide really comes into its own is with the crossbills, genus Loxia. The somewhat problematical recent split of the Cassia Crossbill, L. sinesciuris, from the rest of the Red Crossbill, L. curvirostra, has sparked interest in crossbill field ID for countless birders, including me, so to have a guide devote no less than 33 pages to the biology, behavior, and identification of the Red Crossbill complex is nothing short of marvelous. Key to identifying Red Crossbills is variation in their flight calls, which in turn indicate different “types” of Red Crossbills, with distinct ranges, ecologies, bill morphologies, and vocalizations.

Each Red Crossbill “type” is given a detailed range map with core and secondary zones of occurrence, as well as primary and secondary zones of irruption, clearly delineated, along with spectrograms of flight calls for identification purposes and a series of bar charts showing the tree species used for food throughout the year. The amount of detail is staggering. Take just one example: In describing the flight call of the “Enigmatic” Crossbill (Type 7), the guide reads, “May sound chirping or a bit between a Type 2 and Type 5 or even Cassia-like…Spectrogram can have a quick downsweep followed by a rise, then a fall, or just a rise with longer fall…” It would be difficult to find another guide that describes visual differences between two species as well as this guide does vocal differences between subspecies.

This guide ticks all the regular boxes: detailed identification sections, descriptions of ecology and behavior, and coverage of all species. But what ties it all together doesn’t fit into any of those categories and indeed is difficult to even put a finger on. It might be best described as the authors’ true love for these finches being conveyed through every facet of the book. Although present everywhere, this contagious enthusiasm comes through most strongly in the species account introductions, where personal anecdotes are mixed in with factoids about behavior and identification. The humor in these passages sometimes falls flat, but the species account introductions nevertheless succeed in truly capturing the “essence” of the bird in question. That is what this guide does best: It informs about objective, scientific, and “important” details pertaining to finches, but it also simply makes the reader want to go out and find some of those oh so remarkable birds.

What more could a birder ask for?