Budgerigar

Budgerigars are small, long-tailed parrots native to the open interior of Australia. Wild birds are principally green and yellow with dark barring across the head and wings, although captive breeding has produced many color forms. They inhabit grasslands, savannas, scrub and agricultural country, moving widely in response to rainfall, seed production and available water. Large, highly mobile flocks may form when food becomes locally abundant. (Animal Diversity Web)

These parrots feed mainly on grass seeds gathered from the ground or directly from plants, often visiting water in coordinated flocks. Rainfall can initiate breeding whenever favorable conditions develop. Pairs use cavities in trees, fence posts or similar structures without building elaborate nests. Females perform incubation while males provide food, and both eventually contribute to feeding the chicks. Their social behavior includes frequent vocalizations, mutual grooming and close flock coordination. (Animal Diversity Web)