Examples include parent birds feeding open mouths, fear response to predators, and brooding behavior. Imprinting also is involved in such things as adult habitat preferences, selection of nest sites and materials, etc. Important in modifying Fixed Action Patterns to fit environmental circumstances more precisely. A good example is tool using in birds. Much of bird behavior is innate, consisting of fixed action patterns, but fixed action patterns can be modified by conditioned learning to better match environmental conditions.
Visual displays are the other major method.
A higher number of frequencies increases information about direction and distance. This type of call is good for contact calls or mobbing calls. Faint, high-pitched, narrow frequency range, and long duration. This type of sound conceals the exact location of the sound-producer, but conveys information to conspecifics in the general area. This type of call is good for alarm or warning calls.