NABirds stands for North America Birds and can be used for fine-grained bird classification tasks. NABirds V1 is a collection of approximately 48,000 annotated photos of 400 bird species commonly observed in North America. Each bird species has more than 100 photos, with males, females, and juveniles individually annotated to form 700 visual categories. The dataset contains 23,929 training images and 24,633 testing images.