Macaws are birds unique to the tropical rainforests of South America, so they make ideal subjects for a postcard. After all, what is the purpose of a postcard? It is to tell someone else about the place you are in as well as how you are. People collect postcards as mementos so iconic subjects, such as macaws, are ideal for people trying to sell the card. The macaw is a frequent topic for photo postcards too.
Perched on a branch this scarlet macaw (see photo) surveys the scene below; two tortoises walking along the river bank, and someone paddling a loaded canoe. The clouds across a blue sky are a quite typical of weather in the Amazon. The card is signed 'J. Mesones.' (See also stylized sunset.)