Audio Visual Index data for 'Species identification apps increase acoustic detections in bird citizen science data'

File details the number of audio, photo and video recordings in Bird Conservation Region 23 (BCR23) used to calculate the Audio-Visual Index (AVI) used in 'Species identification apps increase acoustic detections in bird citizen science data'. The AVI itself is calculated as AVI = audio/(audio + photo), which we then scale for use in the paper. Details can be found in the related GitHub repository.