. La Civic A biologia : presentato in problemi. Biologia; servizi igienici. L'IMPORTANZA ECONOMICA DEGLI ANIMALI 209 è il nemico naturale dell'arancio, scala la coccinella, o ladybird beetle. Nello stato di New York può spesso essere trovati feed- ing sulla pianta pidocchi, o afidi, che vivono su roseti. Le carogne di coleotteri e molte acque maggiolini di agire come scavenger. Il sagrestano scarafaggi morti seppellire le carcasse di animali. Le formiche in paesi tropicali sono particolarmente utili come scavenger. Insetti, oltre a impollinare i fiori, spesso fare un servizio da mangiare erbacce dannose. Così molte piante nocive sono tenuti sotto controllo. Abbiamo h

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. A civic biology : presented in problems. Biology; Sanitation. THE ECONOMIC IMPORTANCE OF ANIMALS 209 is the natural enemy of the orange-tree scale, the ladybug, or ladybird beetle. In New York state it may often be found feed- ing upon the plant lice, or aphids, which live on rosebushes. The carrion beetles and many water beetles act as scavengers. The sexton beetles bury dead carcasses of animals. Ants in tropical countries are particularly useful as scavengers. Insects, besides pollinating flowers, often do a service by eating harmful weeds. Thus many harmful plants are kept in check. We have noted that they spin silk, thus forming clothing; that in many cases they are preyed upon, and that they supply an enormous multitude of birds, fishes, and other animals with food. Use of the Toad. - The toad is of great economic importance to man because of its diet. No less than eighty-three species of insects, mostly injuri- ous, have been proved to enter into the dietary. */ A toad has been ob- served to snap up one hundred and twenty- eight flies in half an hour. Thus at a low estimate it could easily »/ destroy one hundred insects during a day and do an immense ser- vice to the garden dur- ing the summer. It has been estimated by Kirk- land that a single toad may, on account of the cutworms which it kills, be worth $19.88 each season it lives if the damage done by each cutworm be estimated at only one cent. Toads also feed upon slugs and other garden pests. Birds eat Insects. - The food of birds makes them of the greatest economic importance to our country. This is because of the relation of insects to agriculture. A large part of its diet of most of our native birds includes insects harmful to vegetation. Investigations undertaken by the United States Department of HUNTER, CIV. BI. - - 14. The common toad, an insect eater.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe

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