GARDEN PESTS IN NEW ZEALAND 



Based on the nature of their diet, birds fall into three principal 

 groups: (1) those feeding almost solely upon seeds and fruits: 



(2) insectivorous birds feeding on insects and other animals; and 



(3) the omnivorous species feeding both on insects and vegetable 

 matter. The seed-feeding birds are a potential menace to the agricul- 

 turist, though in Xew Zealand the native species are fundamental to the 

 well-being of the native forests; the insectivorous birds are obviously 

 beneficial, though they devour both destructive and useful insects ; while 

 the omnivorous birds may be either useful or harmful, according to the 

 circumstances. It should be remembered that, no matter what the food 

 of the adult bird may be, most species give their young a diet of insects 

 or other animal matter. When it is realised that the weight of nestling 

 birds increases from one-fifth to one-half each day, requiring at times 

 more than half the weight of the nestling in food, one can better 

 visualise the enormous quantities of insects daily destroyed for this 

 purpose. Consider the common house sparrow, which is usually con- 

 demned : an analysis of the nestling diet has shown that it consisted of 

 40 per cent, grain and 60 per cent, insects and related forms, while that 

 of the adult comprised 75 per cent, grain and 25 per cent, insects, etc. 



To summarise the situation, it may be said that, on the whole, 

 enormous numbers of insects are destroyed by birds each year, and, 

 unless allowed to become abnormally abundant, the benefit derived from 

 birds outweighs the damage they may cause. 



Hedgehog. 



The hedgehog was first introduced by the Canterbury Acclimatisa- 

 tion Society in 1870, and later by other societies and private individuals. 

 The animal is now very abundant in many parts of the Dominion. 

 Though condemned and destroyed by some people, who consider it a 

 menace to eggs, chickens and even vegetables, the hedgehog is really a 

 very useful animal, in that, being a night prowler itself, it destroys 

 numerous nocturnal pests, such as slugs and snails, earwigs, grass cater- 

 pillars and cut-worms. 



The hedgehog, on the approach of winter, constructs a nest in some 

 suitable place, where it becomes torpid and hibernates. On the advent 

 of spring, it becomes active once more, and during summer produces a 

 litter of four young; a second litter is sometimes produced in the 

 autumn. 



