This challenge is part of the Computer Vision for Wildlife Conservation (CVWC) workshop that will be held on October 27, 2019. The workshop homepage is https://cvwc2019.github.io/
The challenge page is located here: https://cvwc2019.github.io/challenge.html. The training data will be available on June 28th, the testing data on July 26th. The deadline for results submission is August 2, 2019.
The dataset creators have provided an arXiv Paper (locally cached pdf) detailing the dataset.