THE MOCKERY BIRD by Gerald Durrell
Simon & Schuster; 224 pages; $13.95
Zenkali lies on the line where the waters of the Indian and Pacific oceans meet and merge. But don't look for it; the island exists only in the febrile imaginings of Gerald Durrell. The author of some 15 nature and travel books is unlikely to threaten the reputation of his brother Novelist Lawrence Durrell (The Alexandria Quartet). But there is a sting in his tale of The Mockery Bird, and a pawky satire familiar to viewers of such politi cal cartoons as The Mouse That Roared.
The title role is taken by...