There are countries with a less fertile soil and a worse climate than ours, yet richer in bird life. Nevertheless, England is not poor; the species are not few in number, and some are extremely abundant. Unfortunately many of the finer kinds have been too much sought after; persecuted first for their beauty, then for their rarity, until now we are threatened with their total destruction. As these kinds become unobtainable, those which stand next in the order of beauty and rarity are persecuted in their turn; and in a country as densely populated as ours, where birds cannot hide themselves from human eyes, such persecution must eventually cause their extinction. Meanwhile the bird population does not decrease. Every place in nature, like every property in Chancery, has more than one claimant to it--sometimes the claimants are many--and so long as the dispute lasts all live out of the estate. For there are always two or more species subsisting on the same kind of food, possessing similar habits, and frequenting the same localities. It is consequently impossible for man to exterminate any one species without indirectly benefiting some other species, which attracts him in a less degree, or not at all. This is unfortunate, for as the bright kinds, or those we esteem most, diminish in numbers the less interesting kinds multiply, and we lose much of the pleasure which bird life is fitted to give us. When we visit woods, or other places to which birds chiefly resort, in districts uninhabited by man, or where he pays little or no attention to the feathered creatures, the variety of the bird life encountered affords a new and peculiar delight. There is a constant succession of new forms and new voices; in a single day as many species may be met with as one would find in England by searching diligently for a whole year.