Coloration and silence.
Bird calls that can be repeated from bird to bird for miles are one signal.
Birds are noisy unless a predator is spotted, silence translates to a broadcast message of danger.
Feathered factoid: parrots in the wild spend 60% of their time seeking food and 40%of their time trying not to be food
Flight is helpful and although you hear about predatory birds like falcons, their in-flight kills an average of less than 20%.
Parrots are some of the most colorful birds and they make color work for them.
In the wild, females Eclectus breed in deep in hollow trees for safety, ergo their (red) coloring is very hard to see in the dark space they raise babies in.
Male Eclectus parrots are green because they spend most of their time foraging for food among trees which are green so it’s a safety mechanism for them.
Warning graphic content!
Patagonian conure parrots (the size of a Timneh African Grey) are this color because they reside underground and under rocks. (see featured image above).
Only one species of parrots builds and lives in nests and that’s the monk parakeet aka Quakers.