Labels:brass | grass | mountain | roof | sky | trade name | tree OCR: Acknowledgements The completion of this project would not have been possible without the help and support of the following persons, organisa tions and institutions, whose varied forms of help encouragement and support are gratefully acknow ledged: Alan Baker, BBC Natural History Unit Film Library Helen Wharam, BBC Natural History Unit Sound Library Michael Bright, BBC Natural History Unit Jeff Thomas Alastair Ewing, Rissa ap a Paz. Vivi ien Bacigalupo Open University) Todd Holmquist, Andrea Levin Trevor Burke (Luther College lowa Cecil Schwalbe, University of Arizona Randy Babb, Arizona Department of Game and Fish Jenny Ertle- -Rickard (Ransom Publishing) Stephen Rickard Ransom Consulting Clare Christian (Ransom Publishing) William Beac ham Richard Mayer, Susan Scarborough Karen Smith Chri ...