For this last episode of 2019, we take a look back at some favorite bioacoustics recordings featured here on the Mongabay Newscast and play them for you.

As regular listeners will know, bioacoustics is the study of how animals use and perceive sound, and how their acoustical adaptations reflect their behaviors and relationships with their habitats and surroundings. Bioacoustics is a fairly young field of study but it is already being used to study everything from how wildlife populations respond to the impacts of climate change to how entire ecosystems are impacted by human activities.

Here's this episode's top news:

• Tropical forests' lost decade: the 2010s
• Central American countries pledge to protect Mesoamerica's '5 Great Forests'
• Mountain gorilla census reveals further increase in numbers

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