Some Common Birds in Their Relation to Agriculture - F E L Beal - 書籍 -  - 9798690987145 - 2020年9月30日
カバー画像とタイトルが一致しない場合、正しいのはタイトルです

Some Common Birds in Their Relation to Agriculture


商品が入荷したらメールで通知を受け取る
プロフィールはありますか? ログイン
クリスマスプレゼントは1月31日まで返品可能です
F E L Beal の新しいリリースのお知らせを受け取る
iMusicのウィッシュリストに追加

まだ評価がありません

It has long been known that birds play an important part in relation to agriculture, but there seems to be a tendency to dwell on the harm they do rather then on the good. Whether a bird is injurious or beneficial depends almost entirely upon what it eats, and in the case of species which are unusually abundant or which depend in part upon the farmer's crops for subsistence the character of the food often becomes a very practical question. If crows or blackbirds are seen in numbers about cornfields, or if woodpeckers are noticed at work in an orchard, it is perhaps not surprising that they are accused of doing harm. Careful investigation, however, often shows that they are actually destroying noxious insects, and also that even those which do harm at one season may compensate for it by eating noxious species at another. Insects are eaten at all times by the majority of land birds, and during the breeding season most kinds subsist largely and rear their young exclusively on this food. When insects are unusually plentiful, they are eaten by many birds which ordinarily do not touch them.

メディア 書籍     Paperback Book   (ソフトカバーで背表紙を接着した本)
リリース済み 2020年9月30日
ISBN13 9798690987145
ページ数 56
寸法 140 × 216 × 3 mm   ·   77 g
言語 英語  

F E L Bealの他の作品を見る