CollarID is a device that tracks animals and their environment synchronously, as a new tool for wildlife biologists to answer fundamental questions about the interactions of large predators over its one-year deployment. By combining environmental data (i.e., acoustics, temperature, humidity, and gas) from CollarID with animal movement and behavior data (via GPS and accelerometer) from both CollarID and widely-used GPS collars, researchers can gain valuable insights into endangered populations.