The Caltech-UCSD Birds-200-2011 Dataset is a bird dataset for image classification. It is an extended version of CUB-200[7], covering 200 bird species and a total of 11,788 images. Compared with the previous version, it doubles the number of images in each category and adds new parts for localization annotation. All images are annotated with bounding boxes, part locations, and attribute labels.

This dataset was released by the California Institute of Technology in 2011, and the related paper is "The Caltech-UCSD Birds-200-2011 Dataset".