If your immediate reaction to today's picture was 'Ooh, what a beauty', then congratulations as you have succesfully identified your first butterfly of the Amazon! This is Baeotus deucalion, or Deucalion Beauty, one of four species in the beauty family. They all have these heavily-patterned undersides and either orange or blue upperparts, and would often follow the boats along the Cristalino, occasionally landing on the guests.
