. Animal studies. ADAPTATIONS 301 ous coat is very thick and serves to protect them effectu- ally. This is especially true of the beetles. Some insects are inedible (as mentioned in Chapter XXIV), and are con- spicuously colored so as to be readily recognized by in- sectivorous birds. The birds, knowing by experience that these insects are ill-tasting, avoid them. Others are ef- fectively concealed from their enemies by their close resemblance in color and marking to their surroundings. These protective resem- blances are discussed in Chapter XXIV. 257. Adaptation for rival- ry.—In questions o
. Animal studies. ADAPTATIONS 301 ous coat is very thick and serves to protect them effectu- ally. This is especially true of the beetles. Some insects are inedible (as mentioned in Chapter XXIV), and are con- spicuously colored so as to be readily recognized by in- sectivorous birds. The birds, knowing by experience that these insects are ill-tasting, avoid them. Others are ef- fectively concealed from their enemies by their close resemblance in color and marking to their surroundings. These protective resem- blances are discussed in Chapter XXIV. 257. Adaptation for rival- ry.—In questions of attack and defense, the need of meet- ing animals of their own kind as well as animals of other races must be considered. In struggles of species with those of their own kind, the term rivalry may be applied. Actual warfare is confined mainly to males in the breed- ing season and to polyga- mous animals. Among those in which the male mates with many females, he must struggle with other males for their possession. In all the groups of vertebrates the sexes are about equal in num- bers. Where mating exists, either for the season or for life, this condition does not involve serious struggle or destructive rivalry. Among monogamous birds, or those which pair, the male courts the female of his choice by song and by display. ;. 171.—Torpedo or electric ray (NaT- cine brasiliensis), showing electric Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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