. Beginners' Zoology . n? Grasshoppers are very scarce in Europe as they love dry,warm countries. Why do lo-custs migrate ? Give an in-stance in ancient times. How long do most grass-hoppers live ? Does a grass-hopper spread its wings beforeit flies ? Does it jump and flytogether ? Can it select theplace for alighting ? Note to Teacher. — Field work inZoology should be systematic. Every trip FiG. 121. - Four Walking Stickhas a definite region and definite line of study in view, but every animal seen should be noted. The habitat, adapta-tion by structure and habits to the environment, relations
. Beginners' Zoology . n? Grasshoppers are very scarce in Europe as they love dry,warm countries. Why do lo-custs migrate ? Give an in-stance in ancient times. How long do most grass-hoppers live ? Does a grass-hopper spread its wings beforeit flies ? Does it jump and flytogether ? Can it select theplace for alighting ? Note to Teacher. — Field work inZoology should be systematic. Every trip FiG. 121. - Four Walking Stickhas a definite region and definite line of study in view, but every animal seen should be noted. The habitat, adapta-tion by structure and habits to the environment, relations to other animals,classification of animals seen, should be some of the ideas guiding the excursions may be divided somewhat as follows, according as opportunitiesoffer: Upland woods, lowland woods, upland pastures, fields, swamps, a fresh-water lake, a pond, lower sea beach, higher sea beach, sand hills along shore,roadside, garden, haunts of birds, insect visits to flowers, ground insects,insects in 72 BEGINNERS ZOOLOGY Collecting Insects.—In cities and towns, insects, varyingwith the season, are attracted by electric lights. Beetles^and bugs will be found under the lights, moths on postsnear the lights, grasshoppers and crickets and other in-sects in the grass near by. A lamp placed by a windowbrings many specimens. In the woods and in rockyplaces, insects are found under logs and stones and underthe bark of dead trees. In open places, prairies, meadows,and old fields with grass and flowers, it will be easy to findgrasshoppers, butterflies, and some beetles. Ponds andstreams are usually rich in animal forms, such as bugs andbeetles, which swim on or under the surface, and larvaeof dragon-flies crawling on the bottom. Dragon-flies andother insects that lay eggs on the water are found flyingin the air above. (In the spring, newly hatched crayfish,tadpoles, and tlie eggs of frogs and toads should also becollected, if found.) Moths may be caught at night byd
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