In May 2005, Houghton Mifflin Company published one of their first Spanish-language nature books, and the very first field guide to North American birds to be published in Spanish:  Guía de campo Kaufman a las aves de Norteamérica. In an interview in February 2005, Kenn Kaufman described the motivation for producing this guide: “I'm a believer in the idea that we'll have more support for wildlife conservation if we have more people interested in nature. The Hispanic population is such a large and dynamic part of the U.S. citizenry ... Naturally a high percentage of Hispanic Americans are totally bilingual, and could easily use an English-language bird guide if they wanted to. However ... the 2000 U.S. Census showed that over 28 million people in this country speak Spanish at home. It seemed logical to produce a bird guide in the language with which they would be most comfortable."