In 2017, São Tomé and Príncipe underwent monetary reform, introducing the "Second Dobra" and a new set of circulating coins that all feature birds.
The 20 centimos coin features a São Tomé green pigeon (Treron sanctithomae) an endangered bird endemic to the island of São Tomé. Its natural habitat is tropical and sub-tropical lowland forests. As this habitat has disappeared, so has the bird, with only about 10,000 individuals remaining (as of 2020). "Cessa" is a local name for the bird.
Thanks to Flavio S. for identifying this one for me!
All coin images in Daniel's Coin Zoo are from my personal collection. I collect, research, and personally photograph every coin displayed on this site. PLEASE do not take my images without permission. If you would like to use any coin image you see, just ask me. Thank you.