This Plover is a tide bird, “seeking a large portion of its food on those extensive sand flats left by the receding waters, which may be adjacent to marshes where the grass is short, and which are interspersed with barren places where there is no grass, also to uplands and fields where the grass is scanty or closely fed down by sheep or cattle. It is to such places that they like to resort when driven from their feeding grounds on the sand flats by the incoming tide. They also frequent, at such times, the crest and dry sand of the beaches and shoals; here they remain until the tide has sufficiently ebbed to permit them again to return to feed.” The Black-bellied Plover gives but little attention to home building. Its nest is a mere depression in the ground lined with grass and leaves. SOME BIRD WONDERS. Geologically considered, the migration of birds had its origin in the beginning of the Post-Tertiary period of our globe’s history. Prior to the Glacial Epoch there was no migratory instinct among the feathered tribes of the earth’s fauna for the simple reason that there was no necessity for such a change of habitat. Thus the annual recurrence of this phenomenon has been going on not since the creation, as many suppose, but for units of ages whose lapse can be reckoned only by millenniums of calendar years. It is not the time and place here to discuss the means by which this length of time can be even approximately determined, but there are certain inferences and conclusions which are well endorsed by scientific research. For our present purpose it is quite sufficient to say that the Glacial Epoch wholly changed the climatic relations of the polar and middle latitude regions of our globe. From the semitropical conditions which once perennially existed there, these regions have since and for ages been subject to the intense cold which now periodically prevails within those limits. There is a growing conviction among geologists that the intense cold of the Glacial Epoch was caused by a change in the eccentricity of the earth’s orbit. If this be true, then the “Great Winter” of astronomers was reigning in all its severity 210,000 years ago. The wild goose, his near relatives, the brant and swan, and other aquatic feathered races, made their appearance on the fifth day of creation. “And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven.” Now this fifth day of creation very nearly corresponds to the Triassic and Jurassic periods of Mesozoic Time in Geology.