Field trips provide real-world learning opportunities in biology education as they promote knowledge about nature among other things. As biodiversity is declining knowledge of species is important for understanding and appreciating the natural world and its implications. Many field guides are digitally available, but differences from traditional book-based guides are understudied. This case study compares the effectiveness of a traditional book field guide with a mobile species identification app during a bird field trip on cognitive, motivational, and affective outcomes for college students (N = 133). Linear mixed models indicate no differences in bird species knowledge between the groups before and after the field trip. However, participants in the book group felt more competent and reported a higher interest after the field trip. This suggests that books could probably still add value to learning in the field. They should not be dismissed as they can be useful tools for students by enhancing confidence and contribute to the learning experience in a different way to mobile apps.