https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/2041-210X.13103
Contest in 2017 for bird call neural nets. Best ones used mel spectrogram of the audio with convolutional neural networks.
The winning algorithm’s code is available: https://jobim.ofai.at/gitlab/gr/bird_audio_detection_challenge_2017/tree/master