For Earth Day, the Smithsonian's National Zoo and Conservation Biology Institute focused efforts on raising awareness about the small number of Sumatran tigers in the world. Only about 400 of these tigers exist on the planet and to spread the word about this extremely endangered species, the Smithsonian partnered with the band 'Portugal. The Man.'
The band created 'The Endangered Song' and produced only 400 hard copies of the song and then sent the precious albums to carefully-chosen influencers, including conservationists, bloggers, journalists, activists and actors. Initially, there were no digital copies of the song in existence, but the idea was that the songs could be "saved" by sharing them with others online. If you want to hear the song, you can search for #SumatranTiger or #EndangeredSong to look it up.