The Eurasian blackbird was introduced to New Zealand in the 1860's and 1870's and is now our most widely distributed bird species. Adult males are entirely black apart from their yellow bill and eye-ring. Females and juveniles are mostly dark brown, slightly mottled on the belly. The female builds the nest and incubates the eggs and the male joins in feeding the nestlings.
Blackbirds are common in a wide range of habitats including suburban gardens, farmland, woodlands and indigenous forests. Their song is given from winter to summer, with the singing male usually perched on a high branch, tree top or power line. They sing most in the early morning and evening. Blackbirds feed mostly on the ground on earthworms, snails, and insects. They also take berries while perched in foliage.
                                                                                                                                                Ref:  Birds Online - Eurasian Blackbird