One of the advantages of illustrating extinct animals is you can make them any colour you like.
This hen is a crested moa, this robust species favoured highly altitude, particularly montane forest. Her skull has a lot of small pits in it, suggesting the presence of a crest.
Moas were a large species of ratite, beaten only in size by the elephant bird of Madagascar. The dominant large herbivore of New Zealand, they fulfilled a similar niche to deer and giraffes, browsing on leaves and munching up twigs and probaby fruit and flowers as well. They asre the only bird to have completely lost their wing bones - not even a vestigal bone remains.
For a bird that has never been seen by Europeans, the ecology of the moa is not unknown, through studying bones, gizzards and feathers many theories can be devised about their behaviour. They were a long-lived and slow-breeding species, probably not reaching maturity until around 10 years old. Egg shells found have been predominently white, with a few bluish-green ones from the Upland Moa. I have taken creative licence here - as I have with the colouring. By studying their tracheal rings, scientists have comcluded that the moa had a deep, resonant call that would travel long distances.
Feathers have been found in a range of colours - red-brown, white, cream and even purple.
Before the humans came to New Zealand, the only predator of these massive birds was the Haast's eagle - the largest raptor ever to have lived. Within 100 years of the Maori arriving on Aotearoa the moa had been hunted well towards extinction and the Haast's eagle died along with it. By the time Europeans arrived they were nothing but a memory.