In the present, parrots have colorful feathers. This allows them to camouflage themselves in all the plants in the rainforest. Parrots eat seeds; They have hard beaks to open the shell. Some seeds have protection. This protection is poison. Parrots carefully open the shell to avoid poison.
If the rainforest were to turn into wetlands, over thousands of years, parrots will have adapt to their new environment. In the future, parrots might have brown (and green) feathers to camouflage. Parrots might have longer legs so they could stand in the water; they also might have a long beak to get seeds in the water. They also might have short tails so it doesn't touch the water.
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