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In Costa Rica the frequent certain flowers, and pass over others of the same colour and same approximate size without noticing them. But the most marked case was of the large brilliant Morphos. My Indian servants always carried with them a fermented paste of maize flour, which they mixed with water to the consistency of gruel as a beverage. On our arriving at the side of a stream in a narrow gorge, invariably, within a few minutes after they opened a package of this paste, although there might not have been a butterfly in sight before, those most brilliant of their kind would come sailing up, always from leeward, and I have made some of my best catches in this manner. I have also caught them by baiting with a piece of over-ripe or even rotting . At other times they were almost unapproachable. They seem to live on fruits just merging into the state of rottenness.
— WILLIAM MORE GABB