Burton, Maurice. <br/><br/>
International wildlife encyclopedia  vol. 21 WAT- ZOR / 
Maurice Burton [and] Robert Burton. 
 - New York :  Marshal Cavendish,  2002. 
 - 3rd ed. 2884-3024 p. :  ill. ;  29 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0761472878 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology.