Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author

Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author

Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author

Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author

Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author

Article first published in Avicultural Magazine Volume 107, No: 1, 2001 Reproduced here by kind permission of the Avicultural Society & the Author