FIRST EDITION, 8vo, pp. xvi, 269,  + colour frontispece and 12 leaves of black and white photographic illustrations. Original green cloth, spine lettered in gilt, dustjacket. Endpapers and edges a bit foxed. Rear dustjacket panel spotted, a tiny touch of wear to one corner.
A sharp copy of New Naturalist Monograph 19, the only one of the monographs to see a second edition.